Hi, I'd appreciated some advice on purchasing a MMJailbird. My wife and I have been using a few Chinese devices bought off Amazon and have enjoyed how it has enhanced our relationship. We now want to get something that allows genuine 24/7 wear - so that I am only let out when she wants a ride. In buying the Jailbird there are a few options that I need help with: 1. Ring size - I am a big lad and have been using the 50cm/2" rings. They seem to fit OK but don't get snug enough to my body and occasionally pull at my balls. When I measure using a piece of string for comfort the measurement always comes out at 52.5cm. What size should I go for? 2. Number of rings - MM offer a double ring. What difference to the function of the cage does this make? What are pros and cons? 3. Delivery - I live in U.K. What were the import costs for other U.K. purchasers? 4. What other advice would you offer based on your experience of buying one? I am keen to get one, just worried I'll make an expensive mistake. Thanks all!