i've used the big 4, scottys, cannons, big jons and walkers...
by far, scotty is my favorite...
Ease of use, Autostop, extendable boom, tip up, parts readily available at canadian tire... are the reasons why
bulky yes, but very user friendly
i've got 2 walker electrics (1 with temp sense) and 1 manual walker... i'd trade them for the scottys anyday...