Yeah, a friend of mine has all the TR808 percussion modules and are very recommended. They are highly tweakable analog drums. We do a lot of analog sequencing but we've triggered them with a MachineDrum using GND-IM machines with good results too.
I would really like to try out their synth modules some time. The Oberkorn mkII seems intriguing as well, but my label mate is currently building an amazing analog sequencer with all kinds of functionality for live interaction for a fraction of the cost.
-crix madine
http://obliq.net