I'm planning to go. Last RT I had the same reservations Kathryn, Heather, and others have mentioned. The ladies (and one man) on the trip were warm and welcoming. The enthusiasm of the group was amazing and contagious. If you have the opportunity, I say GO!!
As far as registering goes, I went back and forth a few times before I signed up. I didn't register until they added 10 more spots after the original allocation filled up. IIRC, there were several disappointed people who couldn't go because it filled up.