Charlie
We have one from new on 03 van so over 5 years old. You cannot fault them on system, just prices are high.
We have had no major faults in all that time, total expense 1 x battery, 1 x pump, 2 or 3 new pressure switchs & resin.
As long as you have large static system no probs, we have commercial 4040 with 3500l black holding tank switched on constant.
Is it with Tucker Poles, we still use these upto 45ft on 1 van & 35ft on the other, 35ft & below they are the best in my opinion, (Tucker Brush), We have third van with Tucker upto 30ft then Ionics carbon above. There are a lot of systems on market & a lot of poles to choose from. One particular reason for using Tucker aquafactors are the black tanks, but, others have changed to these now aswell.
Hope this helps.
Gary