Just so people can find this: I have just got the Holy Trainer 2 and spent one comfortable night in it. I've done an initial review on my blog, and will write more reviews as I put it through its paces (probably another two or three). This is the link to all entries on my blog tagged "Holy Trainer Reviews".
I also have the holy trainer 2, and if you get the correct ring size, you will be locked up quite comfortably.
I have a HT2, but alas the size of it is too small for me. I thought I could live with it, but trying to keep it forced in there cause some painful issues. I wish it could have worked. I love the look of it, the integrated lock, the anatomical ring, and the low profile. If my member was more apt for at 1.4" tube I think it would be one of my mainstays.
I have just received my HT2 (short cage) in the last couple of days, and have to say that it is about the most comfortable devise that I have worn. The integrated lock and the revised assembly makes it so much more easy to put on.