My Mobi V-15 pressure washer has been in regular service for many years now with no complaints.
When I originally received the unit the plastic coupling fixtures looked to be quite weak and I was worried that they wouldn't last long under regular use.
It was actually the spray gun which gave out first, it appears to have correded internally and no longer functions. Tracking down a spare part drew a blank so I turned to my good old friend ebay for the solution.