we have had the 400psi ninja from ashbys for 3 months. its been out 6 days a week and no problems so far. we were told by ashbys to not put water in solution tank over 60 degrees as this would effect the seals. the only problem we have had is ashbys own powder does not seem to dissolve very well and powder residue built up in the wand filters and started to block the filter in the solution tank. this residue could build up in the pump. we have now gone back to prochem powders as we had never had this problem before in the past 20 years.