I am in need of a quality vac system for my ZHP-52. How well does the ultra vac work? Does it reduce materal or just throw it back to the bags. I have been looking at Trac Vac and a few others but could use some input from users One of my issues is capacity. I can't afford alot of emptying time. Is the capacity sufficient? I think their is only a 2 bagger avail for the ZHP.