After two days with the Icon (coming from a Razr Maxx):
Good:
Screen is great, very readable.
Screen and quad-core Snapdragon processor make this a great phone for games. Asphalt 8 looks and performs just as it does on my Surface Pro (although that oncoming traffic is tiny until it hits you). Frame rates are no issue.
Really love typing compared to my old Razr Maxx. The phones are actually quite similar in exterior size, but the WP keyboard is about 40% larger. I am learning to really fly with few mistakes. Autocorrect seems quite good.
Drive mode (which is activated whenever the phone finds my car's Bluetooth) is interesting. I like the idea that it will read and respond to texts by voice, through the car's Bluetooth connection.
The camera is as good as everyone says it is. I need to spend more time to learn about it, but it's not even worth making a comparison - its that much better.
I can uninstall Verizon bloatware. Better if it wasn't on the phone at all, but I love that I can remove it - some apps on android cannot be deleted, only hidden.
As others have mentioned, I can finally unwind my relationship with Google!
The bad:
Screen is not very responsive to touch on the edges. For the most part the screen is excellent, but there is a slight bevel to the edges of the glass, and touch response is poor along this bevel. It's not a huge deal, but I have a row of the smallest size tiles at the top of my start screen and sometimes they don't respond to my taps unless I am forceful. They are small targets, so unless I get used to it, I may have to abandon this layout.
Battery life is poor at best. I knew that this would be an issue, since the battery is only about 2/3rds the size of the Razr Maxx and the Icon is tricked out with that pixel-rich display and quad-core processor, but both yesterday and today I found myself under 25% battery life by early afternoon. I stocked up on an eternal battery because I saw this coming, but I would have liked to have been wrong. My slick new device is hobbled when it's tethered by a short cord to a big yellow cylinder. It's like putting a five gallon tank in a Dodge Viper - It's super fast, but it has to stop and fill up ALL THE TIME.
Old/deficient apps. Can't replace everything, and I didn't think I would have that hard of a time. I am not talking about banking apps either, since most all of that can be done with a browser. But even a standard app like Words of Friends, which I had to pay for, is about 2 years behind its free android counterpart. There's no leaderboard or predictive scoring. I know some folks will say its just a game, but it is something I like to do for 15-20 minutes a day. And I use it by way of example - some official apps just don't do the same thing as their android alter-egos.
Contacts are sometimes jumbled. Suddenly folks with the same first name are rolled up into one giant linked contact. I had one issue where seven contact entries got linked together.
I haven't figured out how to display satellite photos as an overlay on maps. Can this even be done? I use this quite a bit in my job, to look at parcels of land and get a feel for what is around them.
I may be rid of google, but some apps still unreasonably require me to accept sharing my location for them to work. I understand a mapping application needing that, but why does Calculator^2 or Battery need to know where I am? And why should I need a battery app? Why isn't one a part of the OS?
Why isn't there a forward button/icon/menu item on the web browser?
Since my phone uses my Microsoft account, why must I continue to log into all things Microsoft so often? And why isn't my phone auto-populated with my Windows 8 favorites and browsing history?
Well, that's most things off the top of my head after two days with the Icon. I know it will take me some time to adjust to how WP does things, and I know I will have to wait for 8.1 to get some of the OS issues straightened out, so hopefully in a few months I won't miss my old phone anymore.