I switched back to Xenforo from IPS awhile back. I had some polls and they all pulled over fine. (But I went from Xenforo to IPS, then back to Xenforo) so that might have something to do with it. But after converting they come over just fine.
@Russ do you plan on releasing updates for the Beta on your themes, or just final? I would give this a go on my live site, but the theme would be my only hold up.