Actually, this is a port of the PC version...which is just an odd thing to do considering these are supposed to be Dreamcast games and that Sonic Adventure DX is supposedly glitchier then the DC version, and I've heard some people say that this port adds even more glitches on top of that. I wouldn't really know since I still have a working Dreamcast and see no reason to play any version of DX.
That, and having just played the game a few weeks ago, I personally think the DC version of the game has held up perfectly fine, barring a few camera issues. And since this version is making people say otherwise, I will most definitely be avoiding this. (Again, not that I see reason to buy a game I already own anyways)