I don't know how it compares with GPO, but having a dedicated sound map for Overture 5 makes Amadeus a plug and play library for that notation program.  I think that was the Overture developer's main goal, along with providing a decent library with a wide coverage of instruments and articulations for use with Overture, at an affordable price point.
 
The fact that it is a Kontakt compatible instrument is a plus for those that already familiar with that format, or already have other instruments that they are using in Kontakt.

Special $99 offer for Indiginus customers:
http://indiginus.com/amadeus.html
 

ZincTrumpet
One of the items on my Xmas wish list is actually Solid State Symphony from Indiginus but this does look better albeit at a greater cost.

Love Solid State Symphony, but it's a quite different product. There is a connection, though: Tracy Collins at Indiginus created the Kontakt UI for this one.
 

BTW, the documentation is available here. If you are familiar with Indiginus libraries, you'll feel right at home with this UI. Has a nice feature you don't see on many Kontakt libraries: an easy way to move all keyswitch assignments up or down an octave. 
 
So far I've just been walking through the 88 (!) nki's, but what I've heard so far sounds quite good. Need some in-yer-face low brass for your epic movie trailer? It's in there. There is an instrument called Symphony.nki that works a bit like Solid State Symphony, insofar as you can just sit down at the keyboard and start playing monster ensembles - be sure to try the "Dyn Orch / Choir" preset.
 
Note that the reason this library falls into the mid-price range rather than Indiginus' famously low-priced offerings is that Amadeus is NI-registered. That means you can use it with the free Kontakt Player, but also means NI has to get their cut. Compatible with Kontakt 5.
 
 

michael diemer
Can anyone comment on how it compares to Garritan Personal Orchestra? They are both in the same price range. I have GPO, and use the woodwinds and brass and percussion, but rarely the strings as they are the worst of it. It would be nice to expand my budget-level eclectic library of sounds. Especially if the strings are usable.

Micheal I think the strings are pretty good plus you get a lot more. The factors that seem to separate quality in these libs are 24 .vs 16 bit samples, mic positions, sample quality, dynamic range and quality of articulations. As I say, you could do a lot worse. I have GPO and I believe this to be ahead of it in articulations and maybe quality in some samples.It also looks to be an easy program to use from the main UI. If you only want strings Hyperion Strings Micro by Soundiron is a solid low budget choice for convincing strings IMO.
Some of this might concern how varied you want your orchestra template to be. I usually mix my creations up, but some prefer to have everything in one organized place. This looks to be a program like that, especially if you use Overture I suppose it's nice.

bitflipper

ZincTrumpet
One of the items on my Xmas wish list is actually Solid State Symphony from Indiginus but this does look better albeit at a greater cost.

Love Solid State Symphony, but it's a quite different product. There is a connection, though: Tracy Collins at Indiginus created the Kontakt UI for this one.
 

Thanks bit. I thought the UI looked familiar in the YouTube video. Sure sounds nice in that video.
Tempted... but I have just got the upgrade to full Miroslav Philharmonic 2 with Total Studio 2 MAX.
Not to mention numerous other string libraries that I already have! 

Starise

michael diemer
Can anyone comment on how it compares to Garritan Personal Orchestra? They are both in the same price range. I have GPO, and use the woodwinds and brass and percussion, but rarely the strings as they are the worst of it. It would be nice to expand my budget-level eclectic library of sounds. Especially if the strings are usable.

Micheal I think the strings are pretty good plus you get a lot more. The factors that seem to separate quality in these libs are 24 .vs 16 bit samples, mic positions, sample quality, dynamic range and quality of articulations. As I say, you could do a lot worse. I have GPO and I believe this to be ahead of it in articulations and maybe quality in some samples.It also looks to be an easy program to use from the main UI. If you only want strings Hyperion Strings Micro by Soundiron is a solid low budget choice for convincing strings IMO.
Some of this might concern how varied you want your orchestra template to be. I usually mix my creations up, but some prefer to have everything in one organized place. This looks to be a program like that, especially if you use Overture I suppose it's nice.

Thanks for that info Starise. It may be worth a try. What I really need of course, like everyone, is one library to rule them all. One package that is so good you don't need anything else. It doesn't exist. The East Westers will tell you it's Composer Cloud. Honestly, there is so much in there that I doubt I have enough remaining days in this world to wrap my head around it. Small is beautiful. But at some point I need to upgrade my strings. My best ones are Cinematic Strings 2, but I have to also use others with them. Mural Strings from the UK are really nice, that may be the next one I try,

I think that if you use Overture, having one decent orchestral library with instruments that are pre-mapped to something other than GM is a must have.
 
If you don't use Overture, then there are a lot of other options out there.  But Amadeus looks like it should be useful for just about anybody.
 
That's one thing I like about Notion, is that it comes with a built-in orchestral library.  It's not the greatest, but it is fully integrated, and the sounds are better than a stock GM sound font library.
 
I was checking into Garritan GPO 5, but it appears that full compatibility with Overture and Notion was lost in the upgrade from GPO 4 to GPO 5.  I have heard that it sort of works with some tweaks, but is no longer fully plug and play.