One thing that struck me about Sony Ericsson phones when the companies originally got together was that they appeared to have their design by Ericsson and their software by Sony (i.e. fugly and crashing all the time).
By the time I bought one (the Xperia X1) things had improved somewhat, but then they made the amazing decision to not allow Windows Mobile 6.5 onto the X1 (not officially, anyway) - effectively telling existing customers they could either get stuffed, or buy the X2.
There was then a much more favourable option of waiting a few months for the Desire Z from HTC (if you hadn't guessed, I like phones with real QWERTY keyboards!), with me in the meantime telling my friends to not bother with a company that never released even a minor update for a (at the time I got it) £500 handset.
A company that treated its customers with that much disdain frankly doesn't deserve to exist in the market today.