The biggest thing to watch out for is quality control. With these coils, you may get ones that don't have exact spacing, or a good mix of core and wrap. Or possibly a few spots were it just doesn't look right. Now I am not saying whomever is wrapping these are bad, just saying you know with someone putting their own name on the coils will have a little bit higher quality control to it. I know if I started to sell my coils I would be a perfectionist compared to coils I have wrapped for myself. Just my 2¢