I've had a 283 set of tripod legs for few months now which I use with an older Arca swiss monoball. For the money they really do seem hard to beat. They're not as solid as an old Gitzo that I have, but being fair the Gitzo weighs nearly as much as my car, and are nothing like a sensible option for carrying over any distance.
My sister has a Manfrotto of similar size (can't remember the model number), but the RS legs appear to be just as solid and well made.
Don't get me wrong, I'd buy a good set of Gitzos if I could, but they'd probably cost at least 5 times more. They get the thumbs up from me.