I'm with Antics, I think there are actually a couple of us on here.
We're releasing V4 of Antics in the next few days, with improved SU import. The importer was added to our last release and was very well received. There seems to be a real crossover between Antics users and SU users. So we've tweaked the importer a little in V4 to make it even easier to use, based on feedback so far (some from this forum!).
If anyone wants any help with animating their SU models in Antics then please feel free to give me a shout. Or there's an entire area on the Antics forum just for SU tips and tricks.
Gary