Hello,
After having read throu' this thread I've dared to order one of these lingbei mm28 kits. The montage on my trekking bike been easy and forward.
Setup: Siga Oxford 28 " @Rohloff Speedhub with 16t sprocket. Mid Motor: Lingbei MM28 36V 500W (v1 or so) with 42t Chain wheel.
Gotta say...