Without going into boring details, I have replaced my trusty (but failing) Sony Ericsson W995 with a new phone. The W995 was a marvellous beast, with a lovely feel to it, but it had simply become too unreliable.
I have replaced it with an HTC Desire. It has a lovely big touch screen, which is a joy to use (a relief after having had very bad experiences with an LG Viewty), has built-in GPS, and synchronises with Outlook via HTC Sync like a dream. It has enabled me to ditch my HP iPaq, which was relatively large, had battery life of only a few hours, and needed a separate GPS receiver (oh, and a separate phone if you wanted to make calls).
All in all I’m very happy with the new phone. It runs on the Android operating system; I had heard a lot of good things about Android, and a lot of bad things about Windows Mobile 7, which probably influenced my decision. I probably would have chosen the Microsoft route otherwise.
However, after upgrading to Android 2.2 (known as Froyo) the HTC Desire stopped sending MMS messages (though to be honest, I don’t know that this didn’t happen before the upgrade).