1.) MMS messaging.
2.) Custom chat style; I have the Handcent one, which looks like the iphone one with white and green. I had this and stopped and said..."wait, why do i want to be like an iPhone? I have a droid. I can customize! So my background is black, my bubbles are red and teal. Much cooler, everyone oogles over it because they already think I have an iPhone for some reason.
3.) Quick Text; I can reply to text's quickly without going into the actual program.
4.) Chomp SMS doesn't do MMS. If it does, I'll consider it.
5.) Default bored me.
6.) My battery life is fine. I get through 12-14 hours days easily with moderate-borderline heavy use.