Miuzei 2Pcs 25KG High Torque RC Servo, Waterproof Servo Motor Compatible with 1/6, 1/8, 1/10, 1/12 RC Car, Full Metal Gear Steering Servo with 25T Servo Horn（270°）

These are more costly and may be overkill for some aircraft or RC cars but they do work very well and should last a long time. Tested both out of the box and no problems. Bought these to replace two cheap ones from a four pack that loaded the buss down on my receiver allowing only one or two channels to work.

They good cheap servos to have around when one stops working

Not waterproof like claimed to a certain extent. I was in water for a bit while on a trail run with my trx-4. It was performing awesome at first I loved it was working perfect until I went to walk back home the servo quit. It was locked in a turned position for two days until it dried out and the position sensor worked again.

Good

Appears to be of decent quality but only time will tell. Comes with a plethora of arms and levers that should suit most needs. If using them with an Arduino, check out the MAP function to get these 270 degree servos to work properly when the Arduino is looking for only 180 degrees.