With this release you also have all of the Classic instruments from prior versions. These "Mix Ready" kits have been reprogrammed for better sound and realism. These include the "Signature Kits" which are modeled after famous bands and artist like Led Zeppelin, Nirvana, Pantera, AC/DC and many more.
Another cool feature is that when working with the mixer you can blend sounds, create buses, route outputs, create sub-mixes, and more. You can route parts of the kit into outputs so that you can isolate individual parts of the kit so that when you get it into your DAW, you can apply separate effects to each track.
SSD4 ships with a variety of midi drum grooves in different genres that were recorded by real drummers. You can drag and drop the grooves into your DAW from the SSD4 Sampler and since this is MIDI data, you can change the notes and other properties to get the sound you're looking for. Steven Slate Drums 4 Platunum can be purchased from the Steven Slate Drums store for only $249. There is also a scaled down version called Steven Slate Drums EX for $99. You can read about them both at the Steven Slate Store.
I found that Steven Slate Drums 4 Platinum was very easy to use right from the start. You can be set up and running in minutes and the vast range of capabilities is endless. The new SSD Player works great. The kits load incredibly fast and I have already said, you have complete control over all aspects of your sound. You can even use your own samples. If you want serious control over the sound of your drums, then I very highly recommend Steven Slate Drums 4 Platinum.