I have a Birmingham knee mill that was made in Taiwan. It is a well-made machine - meehinite casting, ball screws, chromed ways, turcite on the saddle, and inverter head. I checked the machine carefully and it appears to be within all the published specs for squareness, etc. The head is very smooth and well balanced. There are certainly no gross problems like table slots out of square, and no mechanical or electrical problems. Overall I am happy with this mill.
I have some minor complaints. The manual is written in 'chinglish,' and is bad even by the low standards set by the competition. The plastic ball handles are cheezy. None of the scales are adjustable, and they're all off by just a bit. Those things are mostly trivial, yet still annoying. Even so I would not let these minor issues stand in the way of buying or recommending this machine.
I bought my mill from Quality Machine Tools. Matt (owner) posts in this forum fairly regularly. I recommend that you have a chat with him if you are looking at Birmingham machines. I would definitely buy another machine from him.
Glenn M.