He said they'd work, he didn't say how fast.

To be honest, I don't know how fast they would run but I do know they'd run better on RTG than AGA (unless as I said something's badly wrong with the port, anyway). Tempted to go and try them but I need to sort out why my A4000's network card is a bit flakey on the Prometheus.
@Minuous
Part of the reason it's not been updated is because MAME long ago changed focus from speed to accuracy. Hence anything past about the 0.35 will be woefully slow on an 060, even at 100MHz with a graphics card - certainly the later versions of MAME wouldn't run anything at all usably on an AGA Amiga. NG Amiga, yes, but not AGA.