I love the size of the D2, love the keyboard as well. But it does seem like a stepchild in the Droid line up. Lower res camera, no FM radio, problems with exchange contacts syncing. It's like they didn't want to take any limelight from the X so the scaled the D2 back a notch or two. I just can't live with a device I feel like has been intentionally crippled.
I had a physical keyboard before the DX and don't miss it. Part of it is I am too lazy to always flip the phone to landscape and pop out the keyboard and then pop it back in just to type out a 3 word text message.
I love my X. Have had it for almost a month and it's my first smartphone. I was nervous about no physical keyboard but I love the virtual one and flipped on its side the keys get even bigger. The screen size is a big plus! I have a feeling they're going to retire the D2 early. If anything, the 2 should have come out before the X. I feel the X is a superior device.
The screen size was the clincher for me, and I was worried about the keyboard too. It's still a bit of a hassle. Txting while driving is nearly impossible, but I suppose I shuldn't be anyway. Swype makes it so much better. As I said, it's somewhat of a hassle, but not anywhere nearly as bad as any other on-screen keyboard I've ever used. Screen-size is plenty to make up for any slight shortfalls.