When you say you wore the central boom pivot.....was that the shaft that goes through the main frame or do you mean the pivot that is bolted to the frame ie 4 bolts?On my second one now. First was 1501 24 m bought for £16,000 and sold 10 years later for £11,000 so happy with the resale value. The only major repair was the central boom pivot that wore away other than that only nozzles and filters. The control was through an Amaspray box, easy logical use.
I now have a UF 1801 24m individual nozzle control through ISOBUS and GPS through tractor screen. Now I have got to grips with the tractor task control it is a joy to use. I bought the new one last year when Amazone had an offer on so the cost difference between the individual or section control was less than £2,000. I have no reason to not recommend a UF sprayer other than you would no doubt be able to buy a different make second hand cheaper.