The brushless goteck servos I've used are great. very well built and have so far performed faultlessly.
i have this:
http://www.hobbyking.co.uk/hobbyking...g_0_09sec.html
and the cheaper plastic cased version :
http://www.hobbyking.co.uk/hobbyking...g_0_07sec.html
which is identical apart from the plastic case.
Nori has the same ones. I did a bit of research prior to buying, and the company behind goteck also seem to make some servos that are identical to futaba models. these were heli servos, not specifically these car servos.
I cannot fault the ones i have thought. I've had servos costing 3x the price that felt lower quality. test is in durability and how long it lasts, which i can't report on now.
Drawback (for some) is that you have to order from hong kong (global warehouse) and delivery is about 10 days. I ordered both together uk mail dropship and received the order with no duty. There are none in UK or EU warehouse
I had an alturn servo (£25ish) and it doesnt centre accurately.
Avoid the savox low profile servo. she will strip gears. they are weak.
the 1258mg savox full sized servo is very solid and works well for the money.
i picked up a super sanwa servo second had off here for £25 and its been awesome. That's in my kf, previously rc10 so doesnt see a lot of action. yes i do have a big servo collection. XpertRC have been fantastic as has my hotbodies, but that was £150rrp.
The only one i have broken (twice) was the savox 1251 low profile. avoid that and the newer 1252.