Glad to hear it caught your eye.
You didn’t give much info to go on.
1) What do you consider tight tolerances, and in what material specifically? The shorter you make it the tighter it is. Wood and plastic, It is as good as I could imagine anyone needing in these materials. PCB’s depend on your experience cutting them, Usually better to laser etch the mask, aluminum good enough for the parts I’ve made.
2)Any Good for what? Larger machines aren’t expected to hold as tight of tolerances as small ones. Kind of a conflict with #1.
3)I use mine for milling printer frames and printing parts for the kit, all day everyday.