I am running the BLS-153s on dual elevators, replacing 9650s on my e-Integral. There is little if any slop in the gear train of the BLS-153s. Much tighter feel to the elevators now tho I really didn't have any issues with the 9650s. I am also using BLS-451s on ailerons. I know there are other servos people are using for ailerons, but I have a tendency to stay with a solution that works and I have been using the 451s since they first came out. My original set of 451s have over 400 flights on them with no sign of significant gear train wear or pot wear. I am sure there is some wear there, but I didn't notice much change when I replaced the original set with new 451s.

Woodie
Team Acme LG