As a recent buyer of Realidrums 2.1, I have to caution potential buyers about certain bugs or limitations not addressed in the video or user guide. There are several options that do not work as intended, including the "drag to MIDI" full session option. (It only produces a few bars of the session you played, not the entire thing). The fills feature (adjustable from 1 to 4 beats), will always play 4 beats when playing along with a pattern.
I wish they would have offered a trial version. But the good news is that you can ask for a refund before 30 days.
It claims that it takes the tedious work of selecting too many drum patterns from other virtual drummers, but in fact, you still have to browse through a limited amount of available drum patterns and fills just like any other virtual drum software.
The sounds are pretty good, not as good as Superior Drummer or EZDrummer, but convincing enough.
IMHO, if you already own one of those Toontrack drummers, you should stick with what you have. Toontrack has a much better larger group of available expansion packs (both for drums and patterns), compared to none from Realidrums.
But the biggest drawback for me is that you don't have the drum patterns laid out in verse, prechorus, chorus, bridge, for each pattern like you do with other drums. And trying to create your own verse or chorus parts, are limited by the amount of MIDI information available when you drag and drop into your DAW. The more MIDI information in your pattern, the less MIDI data gets transferred to your DAW track. So if you play a 20 bar verse, with lots of fills, only 8 or 9 bars will actually get transferred over from your session.