+1 on the Futab BLS551, I've got 3 of them and they show no signs of deteriorating in any way, had them since they were first released and the Futaba 9550 they replaced was donkeys years old with no issues either.
Only full size servo I have now is a Futaba BLS451 which is equally great (only have that as I wanted to add weight to the RB6 in the servo area and it's a bit tight to get weights around there / under the servo)
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