Haven't used the Xbox port of it yet (going to eventually!), but I used the PC version to play through Ys I, II, and Dawn of Ys along with Rondo of Blood, Exile and most of Exile 2 (before giving up because it was so fucking cheap and unfair).

Rondo of Blood was nice because it was flippin' perfect, and Exile only exhibited a single graphical glitch during the end sequence. Ys I had a small priority error in one specific scene as well. Really amazing piece of work.

Shame the PC version doesn't have a GUI and it's a shame there's no prebuilt versions for MacOSX. Maybe it'd get more attention and love if it were more user friendly (like it is on the Xbox, apparently)