I have one and use it lots and find it pretty good. Our cars tend to be smaller in the U.K. though. I would recommend getting a double piston one though. I had a single piston one but it was a cheap Chinese thing and it kept blowing o rings.
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I think Richmond tools went bust but here are links to to Metrinch sockets and spanners.
http://www.directsupplyukltd.co.uk/metrinch-tools/c106
http://uk.rs-online.com/web/b/metrinch/
http://www.metrinch-tools.com/website/introductie.php
I have similar sockets to the matco ones they were made by a UK company called Richmond and sold as Metrinch. As they drive on the flats rather than the points of the hex they have fantastic grip don't round and can be used on damaged heads. Driving on the flats also allows them to work on both...