It's a tricky topic
Now I've have never had a problem with them, but I all way say if it's not brok don't fix it. It seems that all the chaps in my club that have had problems with them are all ways messing around with them.
I've never had a problem with myn all I have ever done is take it out the box put it in heli set it up and that's it
Or have I just been lucky