I bought this over the QuadLock bar mount as, being metal, looks sturdier. It fits really easily and allows the phone to be mounted either close to or far off of the tank (the instructions showing the latter, the former simply being the opposite of the diagram).
The only thing Evotech could add would be rubber grommets to negate the requirement for the QuadLock shock absorber. Oh and maybe some different colour QuadLock handles.