Just to be clear, this is a FEMALE orgasm denial blog, just, you know, checking that’s clear. Apparently you guys are fascinated with cock cages (they are a lot of fun it’s true).
Anyway, to answer your question, I’m a grower too, and while plastic is great to get used to the whole cock cage thing, once you’ve figured out what size fits you you really want to get a metal one. One with a solid base ring that is nice and smooth – no hinges!
Now until just recently that was a very expensive option, companies like the one you mentioned charge hundreds of dollars! But there’s lots of really good ones coming from China now. Have a look at the reviews page on the Keephimcaged blog, we’ve followed those recommendations and they’re all very good.
The Arc one is particularly good (although a bit heavy for exercising in).