I've used both a Futaba 9650 - default option for 12th cars, simply the best you can buy - and the Core RC version. Can't fault the Core.
Note that for the GT a 9650 won't fit properly. The spindle ends up way off centre. Real schoolboy error from Schumacher as so many of these servos are used by other classes and available.
Avoid Savox servos. Almost any time someone has a problem with interference or electrics cutting out there is a Savox involved. I don't know what it is, but it seems the Savox is rather picky about which servo and speedo it is used with.
So, for your car Stu, go for the Core item as it is good and will drop straight in. As far as I know, Mark has had his for an age and races often, so I don't think there is a problem with reliability or life. If MB have them for a discount then I'd let my fingers do the walking!!
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