I just picked up a MOTU 828MKII two days ago, and am using it with my HP laptop with no obvious problems. I know you asked about the Ultralite, but I'm sure they're pretty similar in terms of the FW funtionality.
At first I had it plugged into my PCMCIA firewire card because I didn't know what chipset it was. That caused lots and lots of trouble. I've since plugged it into the onboard FW port and all is well. FYI, I have an HP nx6125 with a single Turion64 ML-40 processor. Hope this helps!