A few months ago I saw quite a few post about the Z-spray unit. I would appreciate anyone who owns or has demo'd one to send me your thoughts. I have one of the new Perma- Green Ultras which isn't bad but has a relatively small capacity compared to the Z-Spray, and is worse on hills that the old Perma- Green. I'm trying to justify the price which is about 4K difference. I have a lot of really large properties (10-50 acres) and need something better or another Perma Green.