Just installed a TSDZ2 from Eco-ebike on Thursday. Love it so far, got the kit from them. Dave answered all my questions beforehand and was very helpful. After the purchase, due to a delay in shipping, they threw in an additional controller. I would purchase from them again and recommend them.
Added the kit to my commuter, I gain/lose about 300 feet on the 10 mile commute and the gain is on the way home, which sucks at the end of the day and the usual headwind on the way home. Looking forward to actually riding it back into the office, when I'm not working from home anymore.
Thanks,
LB