Ive never used it myself, but i'd be carefull, there are no safety features that I can see.
Proof that they are genuine & safe is usually in the form of a little yellow lock at the bottom of screen, Icon in address bar (e.g. HHO is a little Lightbulb) or the address bar lighting up green.
It could be safe enough, but Personally I wouldnt be using it. X
I don't know about their internet service, but if you refer to the Reading tack shop then I can 100% vouch they are straight down the line and easy people to deal with