My TR-09 sounds absolutely spot-on and I doubt it will be any different on the TR-08. I am pretty sure that nobody will be able to hear the difference between a TR-808 in good shape and a TR-08 in a proper double-blind listening test.
Samples can work fine too. For me these boxes are so nice because you get all the controls which you can tweak to find the sweet spots for whatever track you’re working on.
And the having the original sequencer replicated exactly is just so much fun!