Because of the far better video camera, and facetime, I traded in my DInc on day 30 and now own two iphone 4's.
Here are my impressions:
Screen quality: iphone much clearer indoors but with less pop, and only marginally better in sunlight. Droid in sunlight: useless, iphone: poor but useable. iBooks on iphone is great.
Video: night and day especially in low light; iphone kills droid inc.
Still: despite the 3 fewer MP on iphone, much better light and over/underexposure handling than droid.
Battery life: I bought the Seidio (sp?) 1750 from amazon and still the Dinc battery life was poor; had to car-charge or usb-charge during the day for medium use.
iPhone: battery equally as poor! MUST charge during day if you like Pandora, use email alot. This is a surprise. iPhone 4 has poor battery life just like the Dinc! I would venture to say worse.
YouTube: Dinc kills iphone, with High Quality using 3g. iPhone High Quality only with WiFi.
General surfing: Dinc kills iphone, since Northern NJ 3G on ATT is SLOOOW.
May be a deal killer. And, my first day with iphone - 2 dropped calls.
Maps/Google: Dinc kills iphone w the Nav.
UI: Dinc wins again, with fun widgets and most important, a virtual HOME and BACK button. Using a real button to do everything is a pain on iphone after lightly touching the home key.
Call quality: the guy who says call quality was poor on Dinc didn't have an iPhone 4; Dinc kills iphone with the best call quality I have ever heard.
Speaker: Dinc louder, better equalization, less mid range/tinny than iphone. Had both playing Pandora, and iphone sounded much worse.
Size: iphone thinner but feels heavier and more delicate/breakable. I liked the soft rubber back on the Dinc.
Apps: funny, iphone apps cost alot more. Seem like rip offs to me. Many in the $6-$10 range.
there you have it. Will keep the iphone for a while. If you don't want to carry around a video cam, iphone is for you. And, facetime is briliant and a keeper for now....