[mman1506]

Originally Posted by Monochron

Are most any spindles with these specs from ebay or Amazon worth the purchase? I'm not sure if spindles are something where anything you get with these specs will do the job, or if you could be causing yourself serious pain by going with a knock off.
Is there anything aside from those specs that I should keep an eye out for? Good/bad manufacturers?

This style of spindle has become common enough in Chinese CNC machines that (assuming the specs match) they are all basically identical and likely made in the same factory. There is no "knock off" and they are all well made especially considering the price. Chinese VFDs can be a bit more hit and miss. I've had good luck with the ones I've used but if you have the budget I'd definitely recommend getting one from a more reputable manufacturer like these ones from Automation Direct.