I use these all the time in my shop. We've found that the rotary contacts in the less expensive ones fail quickly with any kind of real use. I've burned those NT reels out with 11-12 amps over about 45 min. They don't hold the 15 amps they're rated for. The only thing I have luck with on the cheap reals is florescent lights.
Reel-craft and Hubbell are the only ones I've had last under real use. and they're pricey.