The sound is good and instantly gives off 808 vibes as expected. Programming is easier than on the original in my opinion, and there are a few extra sound shaping options which are very handy. Was worried if it would be worth it compared to using 808 samples as I did until now, but for me the answer to that is a clear "yes". The sound is nicer somehow, and the sound shaping parameters change the sound in a way that sounds much more "original" than what I can accomplish with plain sample manipulation. I think both approaches have their usefulness and charm, so I am happy to have both options now.
I was very torn about whether I should get a Vermona DRM1, but even though the DRM1 is a lovely instrument and more versatile in regards to sound shaping (almost blasphemic to compare them, I know), the classic 808 sound and the sequencer on the RD-8 won me over. Maybe I will regret it later, but until then I am happy with my choice.
Only minor nags are that the output volume is a little low, and that one of the rubber feet are a tiny bit shorter than the others, making it wobble a little bit.