Only had ours for a few weeks now (not omni), have done a couple of domestic jobs. We clean mostly blockpaving and when you mention the vac to customers they seem to think its just a bit of a gimmick. We offer it to them so when we go back to do the sanding we can can do the gutters aswell. I think you will easily get a return on the money after a while, dont think I would expect to make a fortune from it but maybe look at it as an added bonus. Commercial seems to be the way to go but so far just getting knocked back by them but will keep trying, do your homework aswell because a lot of commercial want you to be in the safecontractor scheme which is what we are going thru now, hopfully this will open the door to more commercial work.