Pretty good for a freebie! Bit of tweaking and EQ, and you can easily imitate the same kick sound you can hear in just about any house/trance track anymore. Of course, capable of quite a bit more than that. Surprisingly punchy and flexible. If you'd like to mix up your kick sound some, just download this little wonder and start playing around with its parameters. I love it. I'd really like to take some time to just sit around and run it through all kinds of effects to see how it turns out; sadly, haven't had the time for that yet. But I could certainly see this becoming a regular part of my arsenal, since I seem to have trouble finding good samples for free and am no master at modeling my own in programs like Massive. Example of BDX:

https://soundcloud.com/corrupt-data/synth-trash-demo-loop-1.

The kick you can hear in this little loop I made was BDX, the only effects being Cubase 6.5's reverb and a bit of EQ. Not a lot, really, BDX does pretty well on its own. I like it, has a bit of a classic, softer sound how I used it but it can get harsher easily.