good thing about ashbys ninja is u can build machine to your own spec , u can hav 100psi pump up to a 400psi,u can hav 2 stage vacs ,3 stage vacs or heavy duty 3 stage vacs, inline v2 heater adjustable, inline fixed temp, tank heaters fixed heat or adj,auto fill and auto dump options, auto chem, vac silenters, vac boost lids, upto 50ft elec cords ,dry vac options bag and filter free,also an extra power socket on machine to plug in a power wand etc and soon a add on third vac which is a 7.2 3 stage vac which clips to back of machine,so far i hav had nothing but great service