There is one pole more rigid and lighter than the slx, the sl2. If you have only commercial work with long runs of windows then the sl2 is easy the best pole for the job, however if you are doing domestics where you need to shorten and lengthen the pole on a regular basis then the slx is the best pole for the job. If your used to the sl2 then the slx will feel like a tonne, not because it's heavy but the sl2 is soooo light.
Simon.