I had been using a homemade sewing machine motor and rubber tubing crestor for about a decade. It worked "well enough" for making my own arrows, but I always wanted something better. I'd seen the Bohning deal, but that didn't seem like much of an improvement over my homemade rig. I almost pulled the trigger on the old Arrow Specialties crestor a few times, but waited too long and they stopped production.
I found this one last summer at a rendezvous, now sold by J&M Traditions out of Sunbury, PA. They basically took the old Arrow Specialties crestor, beefed it up, and improved it. It cost an arm and a leg, but that was my big splurge for that trip. I finally tried it out this weekend. Oh man, it's nice. The best thing is that the moveable guide and healthy downforce of the wheel keep the shafts spinning so, so straight so you get clean lines. No need to thumb the shaft. Plus, the design keeps a contant pull on the arrow towards the nock stop, so there's no nock receiver to mess with. Finally, the motor/wheel assembly lifts up, so you can swap out arrows without flipping the on/off switch. It's aluminum and very well made. IMO, it's the Bitzenberger of arrow crestors.
Thought I'd pass this along since I've never seen this thing advertised or sold outside of that single vendor at a rendezvous. Really nice outfit if you've been looking for a top-notch crestor.