I work maintenance in a machine shop. So far I have replaced 5 valtex/SPX pneumatic pumps with these. the air driven were prone to failure and these babies are 1/3 the price of a new unit and 1/2 the price of the repair kit. They are used constantly 24/7 and over 2 months have not failed, but for the price they are disposable.Easy set up, ignore the review that had problems if you have a semblance of mechanical aptitude.the adjustable regulator is simple and reliable allowing me to tune the flow to the needed job.Only problem I have had was in the shipping. One unit had a fan shroud that was so damaged it broke the studs off the cast end bell. Returned for a replacement but still haven't received it. there could definetly be better protection.Overall a really good deal