I got this pretty late, in 2014, nearly after a year of its launch. Most phones show their age in a few months time, but this here is still running as fast as the day I opened it. The only difference being the battery life. Lasts for 15-16 hours now, used to do 20 when new. But it can be attributed to age of battery, no of different chargers used and multiple iterations of Windows 10 which just ate up the battery.
Upgraded to windows 10 when they launched the second build but a few things did not work, so rolled back to windows 8.1 in a couple of days. Been on windows 10 for nearly 7 months now and it keeps getting better. It is more of a OS thing rather than the phones fault.
The camera is the highlight: especially during night time photography. blows everyone away, including the latest nexus and 1+ 2.
Only once in month or so I notice that my phone is still in range but when somebody is calling me, it says out of coverage area. Again, might be due to the hardcover which blocks the side antenna lines.