unlocked-mobiles.com - thoughts?

Ponchos

Has anyone had any experience buying from https://www.unlocked-mobiles.com/ ? I'm looking for a new phone and the HTC One M8 is high on my wishlist (yes, I know there's the M9, but I've read reviews that say it isn't much of an imrpovement on the M8 and that's it's not worth the extra £200), and I've found one here https://www.unlocked-mobiles.com/sim-free-mobile-phones/htc-one-m8-sim-free-p-84685.html The site looks legit but just wanted to know if anyone has bought from there before, what the phone was like, what the service was like, etc. Or does anyone know another good site to get the M* from? I've seen the M8 S on giffgaff, but the same review site said that the M8 S is an inferior phone to the M8, so I'd prefer to get the M8.

Any help would be splendid. Thanks everyone