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Overall the encoder looks well built, has firms detents and is a good value but it was not well suited to my application in a uBitx ham radio kit. I had to replace the original encoder and this one is not a good match. The detents covers 2 or more pulses per detent and makes setting the frequency nearly impossible as the steps are too large. I opened one up and removed the fixed detent spring and it works much better, however is has more pulses per revolution than the original still making a setting more precise than needed. My mistake not the product
I've been testing these now for a few days on my bench and they seem reliable. The action is smooth, with reasonably noticeable detent points. There are two steps per detent in the output. Markings on the pins are CLK, D0, SW, VCC, GND. CLK and D0 are the A and B pins. The switch is active low as delivered.
The knob is ok, though it is only a press-fit. The pic is a little deceiving in that the end of the pot makes it look like a really high quality knob but the sides are the same plastic you get on most knobs. Taking one star for the knob quality.