What's the best cock ring to get?

Got this Monday love the metal rings and the wife is quite keen alsohttp://www.lovehoney.co.uk/sex-toys/cock-rings/rigid-cock-rings/

Went a bit mad and ordered this today can't waithttp://www.lovehoney.co.uk/sex-toys/cock-rings/double-cock-rings/

Thy are easy to put on (with a little practice) the look and feel is awesome can highly recommend

http://www.lovehoney.co.uk/product.cfm?p=25216

Sorry guys not got the hang of including links to my posts yet .

this is the one I got monday

http://www.lovehoney.co.uk/product.cfm?p=8066

And this is the one I've ordered today

Didn't want to start a new thread but I was just wondering, what does anyone think is the best position to use vibrating cock rings? I persuaded my OH to use one for the first time and I loved it. He thought it was good but i was on top and the vibe dug into him and was uncomfortable. I like it when it's near my clit though. Any suggestions?

Xxx