"I am an Architect by profession, and this isolating valve spelled quality to me. I purchased only two of that size, unfortunately one leaked, I got it replaced without any hassle and bought two more to keep. I highly recommend them, even if they cost few pence more, they are absolutely worth it."
"I have used these on several occasions, mainly as isolators for taps and toilets. So far I have found them reliable. I prefer them to the screwdriver slot type as, in an emergency, anyone can quickly turn them off without having to go and find a screwdriver of the right size - particularly important for tenants in a rental property."