For me, my BB Storm died, I needed a phone and neither the Dx nor Inc were available on short notice.
That said, I figured "what the hay" and decided to try the D2 and swap for Dx or Dinc within the 30 days, for which ever one was stocked in the store first. I never thought I would like the keyboard or use it, but I now love it. I use swype some, and will more, but having that keyboard is great! Particularly when I cant focus enough to do swype or onscreen. It is mindlessly and predictably easy. Plus, using the keyboard frees up the screen to see more real estate. I am not giving half the screen up to a keyboard.
The screen is great, it is fast, not laggy, and like every moto phone I have ever had, holds a phone signal where others fail. Same with data strength too.
As far as the interface, I find it simple to setup and use. My daughters have had eris's for almost a year and I am very sense aware. I have always liked sense just fine. But now, after getting the D2 setup, it is awkward to use sense. I still like it, but now it seems .... less intuitive compared to what I am now used to. Point being, whatever you use is what you get used to, preferences aside.
It also has stock Froyo. And with root, I am tethering wirelessly and it is fast. I dont know the limit, but I have had 2 computers and an Ipod connected at the same time. I guess that aint D2 only, but it works well.
I have 9 days till my 30 are over. I am still trying to find a reason to switch to Dx or Dinc. I just might keep this D2.