It sounds highly reminiscent of (but not exactly like) those old drum machines that everyone knows and loves, such as the Roland TR series (I guess the name is a play on that - 80n9; took me a while to get)
From what I can gather, Xoxos has been analysing classic drum machine sounds and creating algorhythms to match or approximate them, and I have to say, the results sounds great. Bong booms, clicks, ticks, and pops in all the right places.
You can make it do 808ish sounds, and you can make it do 909ish sounds (there's no PCM samples though, so don't expect 909 style hats etc.) You can make it do things that sound like no particular classic drum machine, but that sound as though they are from a classic drum machine. It's a vibe thing.
If you've used drum synths before, It's very easy to use, very intuitive, and it's very quick to dial in a sound you like. Each section seems to have been thought through very well, with each sound offering individual parameters that give direct access to the stuff you really want to tweak, without any clutter.
Bong is priced very low (too low), and Xoxos offers a discount for previous customers, making it even cheaper.
Bong is for everyone who is interested in useful, quality drum machine sounds. Go get the demo.