CP
When I said they don't last a real long time I didn't mean that they broke. They just start to develop more play than is generally liked in pylon racers faster than 5245mgs or nylon gears. But if you need the small size and the light weight. They are a good way to go. When the lower weight limit on Q500 was 3lbs 8ozs they sure helped me get a scratch built Quickie down to that weight plus leave a lot of room in fuselage back of the wing for receiver, battery etc.
If you haven't used 5125s or 5245s before, be careful of one thing. Don't let them stall, because of mechanical limits on a control surface. If they do they self destruct, without smoke, in seconds.

Denis