I don't know how long it's been out but I upgraded from 4 yesterday.
Here's what's new.
 
I played with it a little last night but didn't get to try out all the new stuff. It's
still the best thing I've used. I actually like it more than "real" setups because
I can still push the air with my JBLs or still have a big sound with the cans.
Not saying it's better than others...just that it is to me.
Just when I thought my system image was complete LOL ...that didn't last long.
 
ILIO also released three new "sound canvases" for Omnisphere which are very cool.
Got email link and maybe just for owners because I can't find a link to them.
 
So if you have Omnisphere and didn't get the email you may want to sign-in and
check it out.

 Nice Spacey....I want it but if I get it I'll be twiddling pretend knobs for days.I have GR 4 which I  like for a lot of material.GR 5 must be better right?

Since you like 4, yep, 5 is better :)

spacey
Since you like 4, yep, 5 is better :)

20% to 40% 25% better.

craigb

spacey
Since you like 4, yep, 5 is better :)

20% to 40% 25% better.

Uh oh...upgrade is 35%...maybe you should wait a few versions Star.

 
(Of course, it's only a 20% downgrade from 5 to 4.  )

I personally think GR 5 is one of the best sims to date. The reason being? They really do have that 12AX7 sound down and no sim I've tried has been able to get that right. One of the plug companies I test for has a pretty huge array of resources at their disposal yet we've still not been able to cop that true 12AX7 sound. But GR5 has it. Some of the IK stuff is really good too, but their stuff is not tube sounding enough for me.
 
Play through a tube amp and listen to the characteristics, how it reacts, how your tones and executions from your fingers and pick play out....or do some pinch harmonics. Then do all the same stuff with some of these other sims and then compare to GR5. GR5 gives me the exact characterisitcs of my 12AX7 rigs. The only problem with it in my opinion is....it's too noisy for certain things and the gate doesn't surpress...it literally gates and can choke off your sound.
 
They have the right idea, they just need to quiet things down. Another thing....GR5 is a pretty big resouce hog depending on what you use in it. It is by far the most CPU intensive plug of the guitar sim bunch in my opinion but it's also the most realistic as far as all the sims I've tested go. And let me tell you, when you work for a guitar plugin company, you purposely test all the competition.
 
-Danny

Danny - Did you try placing this guy in your signal chain?
http://wavearts.com/products/plugins/tube/
 
I'd be curious to hear your thoughts about it - you have a much better educated ear for those things than I do.

spacey
I don't know how long it's been out but I upgraded from 4 yesterday.
Here's what's new.
 

Its been a while - It was included in Komplete 8

GR5 is great, I don't know what effects you get with it since I have Komplete Ultimate which obviously bundles a lot more effects in there, but you can get some great effect chains going for use on anything, not just guitar. 
 
Just don't use too many of those Reflektor reverbs, they're a real CPU hog.