I have had this for a few months now and it has been pretty good. I will start off with the bad, then get to the good.
With this software you can import your own samples, but you can not use your own multi-velocity samples unless you want to assign each different hit to its own note one the piano roll.
My other complaint is that when it went on sale not too long ago I figured they were about to release a new version. I called the number on the SS website and asked them and they told me that they were not, so I decided to buy it. Long story short, they are, actually coming out with a new version very soon...so I would hold on and wait because it will have more samples and I have read online (not on their website) that it will also have flow note technology.
That being said, I started off with EZdrummer, which was ok, but I do like this one much better. The reason why is because I found EZdrummer samples either sounding too squashed from overuse with compressors and a little bit mushy sounding. These samples are much more natural sounding.
There is a collection of samples that have not had any EQ or compression added to them, which is nice if you want to edit to your preference, and there are some mix-ready samples if you want to just be able to drop something in without having to do much work.
I would say if you are a person that thinks modern music is ruined with the loudness war and is unlistenable because the amount of compression on the mix, you will like these samples more (especially if you use the raw samples), but it will require a PROPER touch of compression and some EQ, etc. to your liking.
The drums sound pretty good, the cymbals are OK (not the greatest, but still usable). The grooves that it comes with I don't really care for, but not an issue if you like to create original tracks.
Bottom line. Yes, I do like them, but wished that I would have waited for the new version to come out and I would recommend this over EZdrummer. It may require a little bit more work, but the samples do allow the flexibility and headroom to tweak them to your liking.
I would have given this a review a 5 if it allowed you to import your own multi-velocity samples (which for most people probably would not be an issue at all, unless you are creating your own samples or have some existing samples and want to use them) and if they used different cymbals (the ones included are not bad, just not what I would have selected for my type of music, but still very usable).
One other thing is that these samples do have some type of propriety file compression on them and can not be played by other players (if for example you were wanting to use these samples for their sounds, but in another program).
If this review sounds negative, it is not meant to, but I wanted to point out some things that I wished it would have had.