I'm still using a Lumia 920 on AT&T, and I got it on launch days (11/9/12). My satisfaction with my device is hard to gauge and explain. My 920 still does mostly everything I want and need without issue, so I'm happy with it. I can't be mad at the durability of a device that shows no major wear on it, despite multiple drops (including one onto a concrete sidewalk). However, the battery life is pretty sad (MAYBE a day, though I never need it to last that long), and the device gets unpleasantly hot without much to push it. Then, there's the stuff that's not related to the device itself, and that's all a mess of negativity and frustration.
The 920 is still in my pocket because Microsoft refuses to release a successor on AT&T (way too late for the 930, by the way), not because I love my 920. I'm disgusted with Microsoft's first year as a hardware manufacturer, to put it bluntly. Then there's the OS and application situation. The Xbox Music app we have now is a LOT worse than the previous one, which they had baked into the OS. The lockscreen functionality is gone, and doing simple things like resuming the app or opening it with library changes is really slow. Microsoft's also done a terrible job of getting updates out to OEMs, like with the fact that my sister's got the alleged Windows Phone flagship in the U.S. (the Icon), and it's the only major WP on Verizon to NOT be getting Denim in 2014 (the 822 that replaced her Icon, the Icon's 928 predecessor, and the abomination One are all getting Denim now), and I don't know that anything on AT&T will get the update this year. The app situation honestly feels worse in 2014 than in 2012, mostly because of the fact that while WP has more big-time apps than it did, the glaring holes are even worse to look at when 2 years of existence can't convince developers to put out official apps for things like Snapchat (which I don't use, but have to hear my sister talk about).
So I'm fairly happy with my 920 itself after 13.5 months, but I was ready to upgrade 6 months ago (but couldn't and can't now). I'm really unhappy with Microsoft as a company, and I'm fairly unhappy with the status of the ecosystem. I don't use many apps and only play one or two games on occasion. Probably the biggest source of usage with my phone (after Internet browsing) is music, so when the music application is as terrible as it is, that problem really stands out and bothers me.
I'd rate my device as 8/10 and my happiness overall as probably a 5/10.