Just a quick look at the S1 forum and it reads like any other major release of any DAW. Bugs, complaints, praise, in-fighting and Bub too.

cclarry
Presonus has just made one happy customer! 

Make that Two Happy Customers. Actually, I think I have just become a convert.
 
I don't hang out in the Presonus forums because there are a few Facebook Groups that are very helpful and not a lot of complaining. If those groups don't work for me I just call Presonus and get the help I need.

How large is the Demo?  I may try the demo out, but I have really, horribly bad internet connection.  
 
[Edit:  Nevermind.  I went to the Presonus site and see that Demo only has some of the addons; so it is not too large for me to try out.]

The demo exe install is 92,650 KB.
Then you can pick the additional content you want to install.

There is a TON of add on's that come with it...up to 3 GB in a single download...

Thanks.  I did the 92MB install and it asked to import from my Producer 2.6.2v and I let it.  This way I can check out how it works without downloading the four extra downloads for now.  It worked.  i got to play with Mai Tai. The Demo does not have the Note FX, at least not in the basic 92mb exe file.  
 
Is there anything in the four extra downloads (Inst vol 1 & 2, Drums, Music Loops) that are not in the Producer 2.6.2v?  I have 15gigs worth of instruments and loops from my existing previous install of 2.6.2.

There are 29 downloads in the full Pro Version.
Only 4 in the Demo...

I don't think the included 4 have anything new from 2.6...but I can't swear to it.

Hadn't used version 2 much in recent times. I didn't really have any intentions of upgrading SO2? But after having another poke around Studio One, in a couple of minutes I became aware that I had already created an intro, a verse, and was halfway through a build up to a chorus. Then it hit me how the program just seems to click with me. I can't for the life of me work out why I hadn't used it more?... Next thing I know I'm $149US lighter...
 
Why are there so many DAW options?!!
 
Of course if there weren't as many? I'd be asking why aren't there more...

Four commands that I have posted in the Sonar Features Request forum showed up in ver 3 - Trim to start, Trim to end, Fade to start and Fade to end. You can also assign these to a hot key which saves a ton of time when mixing. I totally miss these commands from Pro Tools.

Yes I think Presonus have been mining our Features and Ideas Forum (hopefully) as much as Cakewalk have been. LOL (?)