On this side of the pond, they're called "FRS" radios (Family Radio Service) -- slightly different freq range, but the same general band. They're pretty much the standard type of "walky-talky" used today here in the states.
I have several Motorola radios and they seem to be well made, and work fine as long as you don't really believe the "5/7/12/15+ mile!!!!!" marketing B.S. that is boldly touted....Line of sight is everything with these radios. We use them for car-to-car chatting when traveling with friends, or out camping - when the kids want to go off and play in the woods.
FRS radios are limited to 0.5 W output, per FCC specs. GMRS specs allow up to 4W. I bought a pair of Icom F4 radios (4 watts) several years ago, too. I programmed them for the various GMRS freqs (and bought the FCC license...$75 per family back then), and a couple of local repeaters that are maintained by radio hobbyists. (That came in REAL handy once when I broke my leg in the woods back in '03). Even had a 25W mobile version in my truck for awhile.
If you're shopping for cheaper "bubble-pack" radios, stay away from any of them that use AAA batteries - those just plain suck. Motorola's radios are generally good quality. For about double the price, I'd recommend the really nice (MIL spec construction) Icom radios.
-RenHoek