I have several and I always have one inside my bag whenever I go out. I don't use it often but you never know when you'll need one.
Exactly

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I have several and I always have one inside my bag whenever I go out. I don't use it often but you never know when you'll need one.
I have both clipa and the hookup and posted a comparison here: http://forum.purseblog.com/handbags-and-purses/the-hookup-vs-clipa-543398.html
I haven't been using the clipa, to be honest it's just a big piece of metal that looks and feels like a handcuff. I know it's cheaper, but for the money I have paid for my handbags I want something that looked good both on the bag and when I am using it. As for using a purse hook - yes, it's a must. The dirt and germs that are on the floor or in restrooms is really gross and I don't want to bring that with me into my home. Being able to hook my bags up even when there is not a hook like a bathroom door is something I now can't live without.
I have two ring types, Clipa and Hookup. They stay on my strap and I can find them! I can use the Clipa one handed on almost anything, super fast and easy. The hookup takes two hands to open or close it but it is a cute heart. Mostly I use the Clipa cause it's so convenient and matches my LV hardware.