I just upgraded to a thunderbolt. I was going to eBay my DX but my girlfriend plays wordfued/words with friends/angry birds on it, as well as uses it as a pda and syncs everything over WiFi. She is currently on t-mobile and does not have a smart phone, nor does she want one. Anyway, I had to go to Chicago for work just a bit ago and she tagged along to do some sight seeing while I was working. She took my phone during the day so she could have GPS. This resulted in me missing some important work calls and emails, and was all around a horrible experience. If this would increase the functionality of the offline X she could start finding things on her own without stealing my beloved Thunderbolt.