So far so good. I apologize for the long post.
I live in a LTE city and unplugged my phone at 7am yesterday. All day out and about, I had 2 email accts set to push, frequent People Hub peeks/refreshes, all afternoon I constantly was using the camera which was set to auto upload to Skydrive, I uploaded a few pics to Facebook, 20m phone call, frequent texts and sporadic email, used the browser just twice for a few mins (not a big web browser user), used Nokia Drive for a 15m journey with screen on the whole time, and finally almost an hour at the end of my day lost that hour of my life playing Wordament (addictive!).
I still had 36% battery left when I plugged back in at 1130pm.
A similar day using my Skyrocket I had to switch out the battery by 2pm.
I was very surprised that I still had juice so late in the day. Considering my typical day is only frequent Facebook/Twitter viewing, texts, and light web browsing, I believe the Lumia will continue to keep up with my usage.
I am slowly getting used to not pulling up Facebook/Twitter as an app. People Hub gives me the same info in an easier to read format. I like the quick hit aspect of it. I love Groups in the People Hub. I know Android 4.0 has something very similar but never seen it in use by friends who have the Galaxy Nexus. Groups allows me to fulfill that filter urge when it arises.
Hardware, I'm still getting used to the weight. I still fear dropping it. The Skyrocket is a feather compared to the Lumia. I thought the power button being on the side was stupid. But, now that I have the phone, it makes sense. My thumb (i'm right handed) naturally goes to the middle of the phone.
As soon it came out of the box, I cut a piece of transparent tape and placed over the long chrome strip section. A bit ghetto but unless you view at certain angle, you can't really tell tape is on there. The tiny circular area above the camera lens I can already see scratches. That I can live with because you have to cram your face up to that area to even see it.
I love that the speaker is on the bottom of phone. No muffling of sound when placed face up on surface. My Skyrocket speaker is on the back and always had to flip it when listening to music. Face up I can look at screen if need be. The speaker is loud. Indoors, I have it set to 10 (of 30) and I can hear it easily across my living room. Listening to music, if there was a lot of bass, above 15 sounded a bit distorted.
When I called someone, all was fine to me. They were loud and clear even when I moved from my apt to outside to my car. I had the earpiece set to 5 (of 10) and cranking up higher just hurt my ear as the person was talking. And, got a bit muffled.
Camera...I know it's been a polarizing topic. For my needs, it meets them. I normally mess with filters and overlays in my photos so I am going to change the look of it anyway in the end. The originals are more just a canvas for me. Yes, there are reasons why the camera should be better. But, it isn't so why waste time complaining? Get the iPhone 4s if the camera is the end all for you or wait for the next Windows Phone release and see what happens. I just didn't realize there were so many photographers with very particular demands out there
My gut feeling is this is not the flagship Windows Phone. This is the model to get the everyday folk to use Windows Phone. The true flagship phone aimed at high end i.e. picky*****es users is coming. But, they won't bother releasing it right now with the state of Windows Phone in the US. The name of the game at the moment is market share. iPhone can get away with high dollar price tags (even at subsidy). Windows Phone cannot. Hence, a "cheaper" phone that still carries bang for its buck.
For the everyday user, if they give the Lumia 900 (and Windows Phone) a chance, will like it. Especially for free (or $99).