Ive got them in my electra, As above i completely agree they are a real pain to set up.

As the electras wheels are in the wing not on the fuse, like they would be in models like the bobcat etc you need to connect the pushrods to the retract servo. Again a pain to do as there is preloading applied to ensure the retracts lock in the down position.

In use however they have been fine, i was initially reluctant to use mechanical retracts in a jet, but as the rest of it is electric I can now see the logic.

I do know of one other electra flyer who absolutely hates them, feels they make the model wobble from side to side, and ended up replacing his.
but Im sure he'll chip in