UPDATE
So, I have used the upgraded (4.1) 3G phone overnight. All of what I said yesterday is still good to go. And that is VERY exciting! The mail is still very responsive, texting is still fast and the navigation between pages is still smooth.
Here are some new findings...
Camera - The time from opening the camera to snap a picture is about 7 seconds. That is better than it has been since updating to 4.0 but not as fast as I remember when I first got the phone. Who knows, it might not be related. However, the photo library only takes about three seconds to get to my pictures. This is a HUGE improvement, as it was taking easily over 10 seconds to get to my library before the 4.1 upgrade.
Settings - since the update to 4.0, the "settings" was the way I would show people how crappy my phone had become. It would take more than 10 seconds to open my settings. It would show the background (small vertical lines) for what felt like eternity. Now, when I go to the settings page, it's up in less than 3 seconds! Amazing!
Alarm clock - this has been an issue for a little while, but I'm not sure if it's related or not. Sometimes, when snoozing the alarm clock will hang. When the time expires for the snooze it stays on the home screen. So, when you open the phone for something else, it says "alarm clock, snooze". This happened again this morning, but really, it's not a big deal. I should just get up on time 😉
I will give you more updates as I continue testing.
So far... AMAZING! I can't wait for it to be available for non developers so I can upgrade the girlfriend's phone. And for all of you to share the same happiness that I have! 🙂