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This review is from: Thule 591 ProRide Twin Pack Bicycle Carrier Roof Mounted (Automotive)
You can see why the 591 proride is regarded as a premium product. It is robustly made and looks just great. It is supplied with all the fittings for square, aero and T track bars. The adjustment range on the clamping arm is adequate for the bikes in our household 1 x adult round tube, 1 x adult rectangular tube and 1 x kids rectangular tube. The clamping arm can also be switched to the opposite side so both bikes can face forwards but be loaded at different sides of the car.
Additional update: If you do switch the clamping arm around you will find that the base of the carrier sits slightly forward on the roof bar and can cause an annoying whistle. If this happens to you try adding some duct tape or similar to the underside of the base to blank off the air gaps. this will get rid of any whistle.