Holy Trainer sizes?

Hi there, any advice how sizing is for the Holy Trainer v3? I've worn a cb6000 in the past but time to replace and like the look of these. Was tempted by the small but heard it may be better to go a size up if not sure. Any one had experience?

Are you referring to the ring size or the cage size. I have the HTv3 Small cage and love it. I measure just shy of 5 inches in length but slightly thicker than average. I also have the normal size cage and I think the small is actually more comfortable. I'd like to get the Nub cage to play with, but that's way too small for true extended wear. It would be fun though. As for the ring I followed the sizing guide and got the closest ring rounding up. It's the most comfortable cage I've worn and I tend to collect them when I can.