after using cheyenne and Dan Kubins all versions i run always the john clark mags with a brushless motor ,the brushless version or replace the motor by self. This machine outperforms every machine that i have used since years. The newer machines to and no i have build my own wireless supply that have 6 amp power and can run over 10 hours and is adjusable from 1v to 25v . I can run 3.27v or 9.82 for very precise controll after i was not happy with the powerpacks thats sold . When i reduce the amp i get a feature like give in the motor too. Its all about a technic thats cheap. I have pay for all by selfbuild around 60 USD