I've been running the ace 1015's which are the same thing for about 2 years now and have only had to replace 1 set of gears in that time due to an over tight servo saver.

1 thing to watch out for is servo horns, use the ones provided if possible as the spline on the servo is not a true futaba match it is slightly smaller.

if you choose to use a different brand servo horn (or have to use a different brand Ie 808 throttle) then all you have to do is cut a small peice of a plastic bag and press the horn over the top of it onto the spline to take out any slack ,this trick works perfectly.

Adrian