I got Twinkle Star and Samurai Shodown V. Twinkle Stars I liked the PC port, we can configure scanlines. Some slowdowns, probably present on the original game (I didn't played another release aside from this one).
Samurai Shodown V port is not that bad as some people point, but it is not good either. Scanlines, and button mapping is necessary for a good release. Just a 1:1 port is not the best way to release an old game, that can be played far better on PSP/PS2/emulated on PC.
A little more tweaks and you'll get more people happy with this port of some great games. It's good to be seeing a Samurai Shodown game officially released on PC, but it needs to be better done. It deserves a better release.