I am very pleased with this pump and gauge set. As a DIYer this is perfect! The knobs feel nice to turn and there are distinct stops at the end och the thread. All fittings also have good threads that are easy to turn. The rubber seals are nice and thick. I have only used the vacuumpump once so far but the performance seems very good for a AC in a car. The oil cap on the pump however is a bit flimsy but it works. I have seen any vapor leaks yet.