Anyone used them and rate them?

http://www.surestop.co.uk/owners/

My parents have a holiday apartment and it's a requirement of the insurance
co that the water is turned off when the place is unoccupied. Looks easier
than shifting all the ****e in the kitchen cupboards to get to the stop tap
everytime someone visits the place.

There is also a PRV needed as the water presure is at 12 Bar. Any reason I
cannot fit this before the water meter? It would make the job a lot easier
if I fitted it before the meter.

--
Adam