I still think you get what you pay for. Maybe short term the servo will last but if it fails can you get parts to repair or is it just disposable. If you are flying a plane with servo reliability on your mind then I would guess the enjoyment is reduced (and possibly safety). I have used cheaper servos but they are relative to the cost of the plane.
These days most of my planes are decked out with Hitecs which are pretty good servo for price and I have had no issues. Then again I remember all those years ago when Hitec was coming into the market and no one I knew would touch them. Now they seem a very popular choice for planes of all sizes.