Harry,I have had a tongxin motor running since september/october so most likely around 2000 miles (difficult to work it out as the velo 8 re-set itself). I bought it cheaply as an experiment for the torq. The only fault has been a wiring one but I must admit that my wiring was a bit makeshift, as I wanted to return the torq to standard at some point - which I will do now. Test is over, ran ok but does squeal a bit off the line on full throttle so not recommended. Finish isn't great after 7 months. I will try and take a picture before dismantling.
Having had the TongXin and BF motors in the same bike, it would be interesting if you could you give a quick summary of how they compare.
Thanks, John