I used Pro Tools and nothing but for almost 10 years. When Studio One
version 1 came out, I got it. It looked very promising, and at the time, I was fed up with not being able to run Pro Tools 8 without an audio interface hanging off of my laptop. I like the "idea" of Studio One
version1 more than I actually liked it. It just was incomplete, and was missing too many things I regularly used. So I went back to Pro Tools. But Studio One
was very quick to learn (and to retain, more on that in a bit). Early last year, I moved to Logic because I had some Logic specific work coming up. The learning curve was pretty big but I figured out most everything in about a week or two, using Groove3 tutorials and a book on Logic.
I ended up really falling for Logic and moved away from Pro Tools for about half of my work. Any writing and composing was done in Logic. But any quick audio I had to track was done in Pro Tools.
Then Studio One
2 was announced, and the feature set made me say wow. I was already a heavy Melodyne user, so having it integrated like it is was mindblowing. So even though I had already invested in both PT and Logic, I upgraded to Studio One
2. And I really do love it. I've finally moved all new work over to it. And one of the best parts is, I remembered almost everything I had learned about it about a year or so earlier. By contrast, I hadn't used Logic for 3 months or so and I forgot most of what I knew about it. So Studio One really is as intuitive as they like to say.
The built in effects are my favorite of any DAW I've used. I'm talking the bread and butter stuff. Comp, Delay, EQ, Reverb, etc. The one thing I miss from Logic is Amp Designer. Amp Designer is by far my favorite amp sim of all time. I just had no problem getting tons of good sounds out of it. When not in Logic, I use Waves GTR3 for most guitar stuff. Though Studio One's Ampire XT is much improved over the original Ampire, it's still not so hot.
But all in all, it's very much worth it. I have the Pro version with the integrated mastering and CD burning suite. Which is awesome.
So version 1 to 2 was a HUGE leap for Presonus. It's also very light on my MacBook Pro. Both PT and Logic would give my CPU problems from time to time when sessions got larger, but I've yet to see/hear Studio One complain.