I've now used ProModeler DS100HV and DS150HV and I have to say these are the only servos I will buy for my R/C planes. They are extremely strong and there is NO slop in the centering or gears. As for strong, I crashed a 3D balsa plane and the servos were undamaged. Always in the past a crash resulted in stripped gears in my other brand micro servo. DS100HV are the answer!
Typical competitors always develop slop in the gears of metal gear servos because of the case design but ProModeler servos have NO slop. It's amazing, you should try them.
They are wide voltage servos too - I have flown them on the 5V BEC settings and up to 8V. Also on 6.6V LiFe packs. Sure, they are a little slower at 5V compared to 8V but in the air I was not able to notice any difference.
Don't hesitate, give them a try!