I use the Craigslist app on my 950XL frequently and a few days ago some of the filters stopped working. I guess that's an example of things starting to break. All core MS apps I use are functioning. I don't use Cortana, so no issue there. Some examples of 3rd party apps that still work well are Pandora, myradar, foxnews, awesome tube, mypodcasts, United, flixster, lots of games, accuweather, photoshop express, dropbox, garmin connect if your watch is supported, iheartradio, mobilepdf and ink calendar. Obviously, most of these apps are more limited in functionality than Android or Apple, but they work. Live tiles still work for most of the 3rd party apps I use. The myradar live tlle is especially useful which I have yet to find a widget on Android that does the same. I don't do social media since I have better things to do with my time, so no comments there. For me, W10M actually works really well even with all the traveling I do. Downloading maps on my phone has been especially useful. I know Here maps on Android does the same, but it seems to work better on W10M. Unfortunately, I suspect more 3rd party apps will start to break anytime. After end of support, I'm fairly certain MS core apps will start to break.