Operates very good up to m10 but struggles after that.
However it is dependant on a good air supply! This thing is hard on it and you want a good cfm rating to get the best of it. I've had mine for 2 years now and it gets regular use with no issues other than a defective air lubricator that came with it. (It gushed oil through it and sprayed a mist of oil out the exhaust vents)
I simply manully lubricate it periodically
Would 100% buy again.
Also, get an er16 straight shank and grind the end to match a tap, that way you can use collets to hold tooling other than taps. Handy for deburring and chamfering holes etc