At my previous job the main reason to stick with indigo was also avoiding the OS upgrade.
Now that I switched to Ubuntu 16.04, I must say that it still feels a lot rougher than 14.04. Basic tools like gitg are unstable and crash a lot. flashback-compiz has issues with rendering of window borders, some tray items don’t work properly (dropbox…), apps using CSD are an aesthetical disaster (at least to my eye… I think its better using other desktops / themes…).
Haven’t encountered any issues with Kinetic though, but I don’t have much legacy code right now.