"These are obviously more expensive than their compression counterparts, but if you want a quick solution, especially on a heating system, they are really good. Havent seen how reliable they are as never installed them before, but as I use JG products a lot, I'd be surprised if they didnt last."
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Review 2 for JG 15HSVP Speedfit Chrome Isolating Valve
"Speedfit make great stuff but you cannot use this on chrome or stainless pipe (I presume as they are too hard for the clips to grip) but why oh why whould you buy a chrome fitting for a copper or plastic pipe?"