Build quality is perfectly fine. The threaded shaft is too long for mounting on pickguards without using 3 mm of washers to shim it down. Once installed, the pot works great.
The switch doesn't feel stiff but I have difficulty pulling it up with a plastic strat-style knob; I have to slide my finger nail under the edge of the knob to get enough grip. On stage? Forget it! Perhaps with a tele-style knurled metal knob it'll be easier, but that's not what I want on my guitar.