Roland's reissues are pretty dull and lifeless compared to the real thing. The x0xb0x and possibly the TT-303 are the only two 303 clones I've heard that get close, probably due to the fact they're close copies of the original's analog circuitry. But even they don't quite get there. That's why the 303 still commands such a high price, even after Roland's ACB reissues.

The 909 and 808 are a lot easier to clone.