I jumped in and bought it when on sale, it's true the demo is very convincing.
This was my first OT sample set, and I've used it on a few tracks and really like it.
The lead sounds are by far the best and most realistic I have heard, and my pitch bend and modulation wheels needed no tweaking at all to get a realistic feeling when playing on a keyboard.
Only knock I have is that it's such a huge collection that it takes about 5 minutes to load up into my system, and I haven't been able to get around that no matter what I try. Once loaded, it plays flawlessly in Sonar Platinum.