Great for DIY project, not recommended for buisness or professional use. You get what you pay for. It gets the job done. Not entirely reliable. Used twice and had to replace the high side pressure quick connect port started leaking, the plastic gasket washers on the hose end fittings will start to leak, recommend using Teflon tape to help seal the deal. The pump and gauges are nice no problems there. It's certainly cheaper than going to a dealer, but to do a full air condition service properly can be time consuming. Overall happy, but definitely do not trust the AC service machine package to hold its own vacuum with it all set up and to be accurate, on the contrary, you want to learn how to service AC and save money, this machine will let you do that.