I purchased my blackberry bold almost a year ago and have so far been very happy with it. I've been a blackberry user for about 2 1/2 years now as I just can't seem to give up the physical QWERTY keyboard in place of trendier touch-screen devices. Blackberry seems to be in a tough spot these days for this very reason. The bold, however, is an example of Blackberry really owning what has made it popular and able to keep afloat: great keyboard, blackberry messenger, and ease of communication without too many extraneous apps and bells and whistles. The bold can download a multitude of apps from Blackberry app world, though this is nothing compared to the range available on such platforms as Droid and iPhone. The trackpad is a great replacement for the trackball and once you have the sensitivity set to your preference, it's easy to get used to.
The speed is generally fast and the included media card allows the phone to hold a lot of media. I have about 50 pictures and about 20 full-length songs and haven't even started to worry about space. The SMS set up mimics the iPhone now, unlike blackberries in the past, assigning a conversation to a contact and displaying all prior texts within that conversation rather than sending each message individually. This is a great change on Blackberry's part. Occasionally, however, the SMS program acts up a bit, not allowing me to compose a new message to someone who doesn't already previously have a conversation created. I've scoured the internet, however, and found that this problem is not very common. It's fixed with a battery-pull restart.
All in all, if you're looking to go a route other than the iPhone/Droid/Touchscreen route, the bold is a great option. As long as you expect it to be a Blackberry and not an iPhone, you'll be satisfied.