I agonized over going from my DINC (had it since release) and getting the TB. I had a NE2 and corporate deal so it only cost me $100. Had my son not begged me for the DINC could have easily sold it for $150-$200. VZW will give you $100 in trade if you don't want hassle with auctions. I was really thinking about playing with it for a week or so and then doing the return since I really was very happy with the DINC. Suffice it to say after experiencing the speed and smoothness of the TB, what I think is much improved phone call quality and improved speaker phone due to a much improved external speaker my son now has the DINC. I thought the size of the TB was going to bother me but the DINC which felt perfect in my hand before now feels, well, small.
If money was not an issue I would not think twice about the upgrade, however I still think the DINC is a wonderful device and would not spend more than the NE2 price if I had an upgrade coming in the next several months.