Xerox 6125 laser toner refill?

I saw this advert on Facebook and it looked too good to be true.
About 1/2 price of anyone else.
I sent my cartridge and received it back refilled in 2 days.
Check it out.
It's unique because they just refill and rechip the same cartridge.
Seems like a good idea.

http://www.andyfox.co.uk/6125%20Web/index.html

Dave