It is very odd to hold a device that is glass on both sides. Without looking the direction it is facing isn’t apparent.  Also, coming from the 3G, it feels very, very slick.  So did the iPad initially, and the constant fear of dropping that has ebbed with familiarity.

The much-discussed problem whereby holding the phone in the left hand so as to bridge the antenna gap causes the signal to gradually degrade and disappear on 3G is definitely real and immediately obvious. If you are buying a phone in store as opposed to delivery this is something you should be checking for.  Hold the phone for 15 seconds with your palm over the gap while it is on (which requires in-store activation).  Hopefully there is a fix, but I assume that it is a hardware problem, as only some phones seem to exhibit it. The rubber Apple Bumper case fixes this, which lends more credence to it being a hardware problem, as the case is non-conductive.

[Update] This problem is not 100% reproducible. I just sat in the car and held the phone, sans-case, in my left hand and the signal did not drop. Returned to house, took case off, and the signal drops immediately when held in left hand as noted above. Could this depend on signal interference as well, such as the wifi network in my house? Will report further. [/Update]

The screen is very, very good. Almost bizarrely clear, as some text, noticeably in the Messaging app, looks far different than it did on older generations of iPhone.

The camera shutter speed is astonishingly fast… for a phone.

Call volume is startlingly loud.  This means nothing for call quality, which I haven’t tested in any serious way.

It’s still an iPhone.

That was a long line.