I bought this set to use during the installation of a mini-split HVAC unit on my house. It worked fine. This set is really designed for servicing the A/C system in your car which I am sure it would work very well for but it probably wasn't the best choice for a mini-split install since the gauge is not very accurate at the lower vacuum levels required for evacuating the system and checking for leaks. It did get the job done, however, so I really can't complain too much.
The set comes with a fairly large range of adapters which makes it quite versatile. The hoses are long enough to be able to hang the gauges where you can see them while working which is often not the case for inexpensive gauge sets. Finally the case is kind of a cheap blow molded plastic but it neatly and compactly stores everything so as far as I am concerned it is a winner.
if you are looking for an inexpensive, general purpose HVAC gauge set I would definitely recommend this set.
Tim E. 
