? about rebuilding a crap rotary

[GuruJeph]

First I would like to say Hi this is my first post on the website and I just started looking around and have found a wealth of info, I would like to thank everyone who has supported to that.

As for my question, I haven't used a Chinese crap rotary but I have used stigmas and neumas for years. Without disrespecting any of the machine builders out there. I was wondering if anyone has bought a Chinese rotary and replaced the motor for a better one. Does it compare? For instance if you replaced the motor from the Stealth with a much better one like a MAXON or a FAULHABER, would it run close to the $400 Swiss that it is knocking off? Personally I would like to buy that crap mantis on ebay with the "adjustable give "and replace the motor for fun. Just to see if I can own a decent running rotary for under a bill.

Thanks