I bought these and they seem to be pretty good. The buttons are as fully assembled as they can be, you can't put on the microswitch, or screw on the nut until the button is mounted.
They work fine with 3/4 MDF. I only have these for now, so I can't compare quality with other buttons or sticks. I have read on this board that they are almost identical to Happs.
The only thing I don't like are the switches. They are loud, and the pitch of the click is different on each one. Again, I haven't tried others, so this may be the case with Happs too.
Overall, I'm glad I bought them. I will buy others in the future to find the ones I like best. For now, these work great, and the price is good.
Shipping was fast too, 3 days to West Coast.
Paul