I liked their hacked objects for the Sims 1, and was sad/angry when they went pay for Sims 2. Once I discovered the booty, I was ecstatic and quickly downloaded as many things as possible from that site.
BAD FUCKING MOVE.
That shit gave me nothing but problems of all kinds. It needs to burn.
I had to check to see if I had posted this and forgotten, because this is exactly what I would have said. I LOVED Simslice Mach I. I used Simslice stuff all. the. time. It was great.
Mach II is crap. I am saddened, and quite annoyed that the site appears to be trying to make a buck off its good rep during Sims 1, but without creating anything truly innovative and amazing for Sims II (yet).
ETA: I don't know about making Sims headless with BoolProp, but I do know that MTS2 (I think) had a better headless Sim that did not have a hollow neckhole instead of a stub.