By some accounts yes. After riding BBS02B 750W and BBSHD 1000W, it's a rather wimpy motor. That said many of us just don't need the higher power and TSDZ2 makes us happy riders.Is the TSDZ2 that good these days?
I kitted a KHS Smoothie with an evaluation motor TongSheng supplied. I gave the bike, motor, and EM3ev 48V battery to a fella living rough and in a boathouse on $600 a month. He's absolutely thrilled by the ride.