I'm very happy with it.
I can only really compare it to the iPhone, as it's the only other 'smartphone' I've used.
Don't get it if you like the iPhone's plethora of cool apps, because the interface isn't quite as quick and responsive and there just aren't as many cool apps for the BlackBerry.
That said, the SatNav works awesome, better than anything I've seen for the iPhone.
The keyboard works nice with the feedback from the screen depressing, but I'm able to type quicker on the iPhone.
Because I work for myself, the BlackBerry data plan I get on my service provider contract is awesome. Free SatNav data, email and web surfing means cost savings. I believe most SPs worldwide supply this type of deal - if you even care about it...
I only use Gmail for email and it works great. GoogleSync also works, albeit a little buggy.
It's a business tool, unlike the iPhone, so many people will prefer the little fruit basket.
I think it's the best thing since sliced bread.