Some wear you out trying to get them started then wonder why you start looking at a newer model
The lucky ones find a soul mate and have a life long marriage to a dependable ,relaible , easy to get on with partner that they know everthing about, allways there when you need them, no skeletons in the cupboard.
But with some, no matter how much you spend on them and how much you think you know them they still let you down at the wrong moment