I purchased this library four years ago. If I had written a review back then, I would have rated it three stars, but as you can see I'm now rating it full score. Reason is that this is a massive library, and it takes time to fully understand how impressive and featured this thing reallty is. It isn't until now that I have fully realised the full potential.
It contains multiple guitars (lead and rythm), basses and drums and I am using the guitars and basses in almost every project. The quality and variation are that good. The drums are not bad by any means, every drumkit has it's strong sides, but they don't really match the detail and effort put into the string instruments.
They layout is great, it looks nice visually and the Play audio engine is really solid. In all honesty, the biggest downside to this library is the installation time. Waiting for the copying and changing the DVDs took forever. Fortunately, it's a one time operation. Once installed, you're good to go!