That's a Digitakt - I feel like I've barely scratched the surface so far but it feels like a fun machine. It sounds surprisingly giant too. Lots of fun to be had with conditional trigs and lots of realtime control, I suspect.
I pre-ordered the TD-3 from thomann.de within hours of the story breaking, as I suspected they'd have it first. I was right, looks like UK dealers won't have it until late January. It's.. well, it's fun. It sounds a lot like a 303 - maybe a bit brighter, and without the characteristic slightly sloppy timing of the original, but surprisingly close. The onboard DS-1-alike works quite well, too.
I've found it to be a tiny bit temperamental with regard to stuff like writing track sequences, and also selecting them for playback on the fly. You sometimes seem to not always get the pattern you're expecting - possibly it reads the selector input slightly before the last step of the pattern?
It has been too many years since I touched a real 303, so I can't honestly remember if this crankiness is normal, or if it's something in Behringer's implementation and potentially fixed in a firmware update.
On the upside, MIDI seems to work without much hassle, and the "synthtool" software gives you simple pattern editing on a computer for those rare times where you decide that you don't want to wrestle with the delightfully weird and intractable 303 UI. Unlike the original, there's no battery option- but it still runs from 9V negative centre, so you can power it from a guitar pedal supply.
Fundamentally, it sounds and feels a lot like a 303, so it's as fun as shit. I was like a little kid once I got it running.
If you want to hear it for yourself, here's a bit of audio, just some simple patterns over simple 4/4 "unf unf" drums from the Digitakt.
(Yes, I realise that the drums are REALLY LOUD, it was more an end-to-end test of connections than an attempt to do actual sequencing or mixing too precisely )