I bought a Siemens Gigaset a few years ago and have 2 complaints about it:
the shape make it very difficult to hold between your shoulder and ear (I know you're not supposed to, but it's inevitable if you need to write something down!)
the blinkin' ***@@!!! keys have stopped working! You pick it up and press answer and it continues ringing right in your ear. you can't key in numbers reliably and even if you succeed, the 'make call' button won't work. It was very expensive at the time too.