I use the Hornby rolling road. Very happy with it. Simple to use and set up.
I actually have two. One is for the Live Steam and has rollers that are un-powered. The other road has powered rollers, so it is fine for tank engines. I used both rolling roads when testing the American Shay and Heisler as the number of powered axles was more than one road could handle:
Hornby Un-powered roller rolling road: R8203
Spare rollers: R8209
Hornby Powered roller rolling road: R8211
Spare rollers: R8212