Well, it's DFAM, you probably know what it is if you're looking at it.
The sound quality produced by it is simply fantastic, and it's capable of doing so much. I use it to create one-shots for my kicks, snares and some weird noise, rich textured sounds, love it actually.
Downsides? Well, no proper tempo selection and it's a pain in the ass to sync it with anything. It is by no means a replacement for a drum machine, it's a very decent drum synth, but if you're looking for something "let me quickly make another nice techno beat" - this is NOT your choice