If you have a metal gear servo you can probably get away without one. I don't use one with my ACE metal gear servo. I used a non metal gear servo for 5 months before it stripped the gears.
It all comes down to how much you crash and how badly. I generally don't have many breakages (maybe 7 in total) or bent front screws on my SX, and others have heaps.
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Rango
St Ives
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