I have always used unger, and found it to be very good. I also use an ettore backflip accassionally on a pole and find that very good also, much better than the unger version (vise versa). As for the trolley, I started off with an omni trolley which was ok, but working with a trolley is slow and it is a pain getting it in and out of the van all the time, I now use a van mount and a back pack which is much better.