Four things, and none of them is the brand on the motor. Whether the technician is insured to work on your property. Whether the part is on the van or a week away. Whether the person who answers the phone is the person who manages the job. And whether the price you were told is the price you are invoiced.
The brand matters far less than most quotes imply. Centurion, ET Nice, Gemini, Hansa, DTS and BFT are all capable units, and every one of them fails early when it is fitted to a gate it was never sized for. What decides the life of an installation is whether somebody measured the gate, looked at the track, and specified against how often it will actually open.
That is the whole of our pitch. We are a mobile gate motor repair and installation business working Sandton, Randburg, Midrand and Centurion, and the thing we try to be better at than the alternative is diagnosis — because the money in this trade is lost on the wrong repair rather than on the price of the right one.