After 3 months, all good.
I have had my rear hub motor kit for 3 months, and so far I am very pleased with it. I opted for the rear kit without the battery since I wanted a bigger battery for more range. The kit arrived in 3 days, all working fine, and the trickiest bit of my installation was tidying up the wires. Like I said, I have put 430 odd miles on it, and so far so good.