They are still in the developmental stage. When i get one going that is adjustable, or at least may better suit your needs, I'll hit you up. I hope by the end of August, I'll have something worth looking showing.
As for stators, very easy to rewind. Ohm it out, and see what it shows. If bad, simply rewrap the dead coil. You can pick up some 34 guage magnet wire for cheap. 1/4lb is more than enough for 1. 1/2lb is usually a little better of a deal at $12. 1/2lb is typically around 5000 feet or so worth of wire.
To rewind them, remove the old wire (cut it off with a dremel or something), insulate the iron laminates, then begin winding. Be sure to leave part of the wire hanging out so you have something to solder too when it's complete. I typically solder a piece of heavy wire to the magnet wire and let the heavy wire stick out. It's more resilient and durable than 34g wire.
To do the actual winding, which is hundreds of turns... I thread the wire through a coffee stirrer and check the iron laminates(stater winding core) into a drill, and let it rip. Gotta keep slight tension on the wire. The source coil isn't picky on the way it's wound. The pick up coil can be. If you wind the pick up coil and it doesn't work right, then switch the leads coming off around and it will.
When your done wrapping, some cheap epoxy that isn't jb weld or anything that can disrupt the magnetic field. I've used that harbor freight clear epoxy weld. haven't had a failure yet (but I'm also removing and experimenting!)