So far it seems to be working well after that fix. Just played some Gauntlet, Battlechess and Arkanoid II.
Speed is good -- I get a little frameskipping when playing Arkanoid II with mess handling the scaling @ fullscreen 720p, but only 2-3.
I did get an error trying to load Pirates!(1988)(Microprose):
Ignoring MAME exception: ADB command 0x0b unimplemented
ADB command 0x0b unimplemented
But I haven't had a chance to compare results on an x86 machine...