I bought one in 2004 and another one in 2006 as back up for a 300 room hotel we were remodeling floor by floor at that time. They both are still woriking till this day. I've only replaced the pump/hose one time on the older one. And had to rebuild my three gun's (the spring rust's out) six or so times total. I do alot of texturing and they are a real workhorse for me. I don't have one complaint. You also can get the larger size knockdown on ceilings that you can't get using a hopper. But, on repairs and stuff I use a hopper. I use a RTX 1000 for that. It has the option to use a hopper or the 7.5 gallon tub on it with the same gun.
Tim, what went wrong with your rigs?