I got a flier in the mail today, letting me know that i can upgrade to any Verizon 4G smartphone for $100 off with 2 year upgrade. I've had the Droid 3 since about August, and wondering if it's worth getting the Droid 4. I do live in a market with 4G coverage, before you ask. One of my biggest concerns is that the Droid 4 does not have a removable battery - is there any type of interrupt sequence? i know Droid 1/2/2g all responded to alt+shift+del. Droid 3 does not respond to this, and I've had to pull my battery a few times because the phone wouldn't respond. It seems like most of the specs are the same between D3 and D4, with the only notable exceptions being D4 is 4g and D3 is "global". I also like the keyboard layout of the D4 a bit better, and i know it has a better processor (1.2 ghz dual core TI OMAP vs. D3's 1GHz dual core OMAP) and more ram (1024 mb vs 512) but i'm not sure if it's $100 worth of "better".