No 4 - Review Why
Hats off to those that have a 4 and love it. Best of luck.
I have a 3GS - updated to iOS4 (ouch).
I live in SoCal and travel a lot.
Spent a couple of days playing with a friends 4 and comparing it to my 3GS to see the improvement.
I use my phone split between business and personal.
Appearance: Very nice

Display: WOW!

Speed: Nice improvement

iOS4: see a lot of the same bugs I see on my 3GS

Proximity Sensor: Very buggy.

- A call holding to my ear resulted in 2x activating screen functions. Had one instance where after a call the screen would not light back up (have this issue on my 3GS w/OS4)
Antenna: OUCH!

- had a lot of fun replicating the You Tube video even using a metal pen.
Multi Task: Maybe someday. Right now it is just a quick switch.

Camera: Impressive but to slow to load.

- my Fuji I can just open and shoot - no lag time.
Facetime: Not impressed. Be nice if it was on other phones or pc/mac

Glass: VERY WORRIED

- I am tuff on my phones. They all have dings. Glass front and back is NOT a good thing. The iPhone is the first I have ever broken a display.
Overall I have to say I am not that impressed with the 4 outside of the display.
I did get to compare it to the follwoing phones for a short time.
EVO and N1.
EVO (running 2.1):
The EVO display makes the i4's look small. Use the EVO for a while, go back to the 4 and you find yourself wishing the 4 screen was bigger.
The feel and grip of the EVO is far superior. It doesn't feel like it is going to slip from my hand.
N1 (running 2.2):
Comparing this to the 4 I came away with the impression they are pretty much tied. The 4 has the display, the N1 has a better OS and flash which worked real good.
This phone was an AT&T phone and I had no call issues. Did 10 calls from this and the 4 in the same locations and had better connectivity with the N1. Did the antenna grip (btw: this is the normal way I hold a phone) with the 4 and dropped 3 of the calls.
Overall: no 4 for me. When the 5 comes out I'll look again.
Think I'll get the N1.
BTW:
the iOS4 on the 3GS is a nightmare. Lots of issues, shorter battery and the proximity sensor issue. Wish I could roll back to 3.1.3.