The Plasma 5 on Mint 18.1 KDE experience continues.
Now that the major wrinkles, like the unwanted mouse trails, have been ironed out, the overall Plasma 5 experience is bearable.
The lack of separate wallpapers for workspaces, and the loss of a lot of the fun settings in desktop configuration is sad, but overall it is ok.
There is one exception to the 'Only one wallpaper across all workspaces'. I can run one instance of a video wallpaper, say and mp4, on a single workspace, while the others are running the usual single image.
At present the most annoying daily problem with Plasma 5 is that it takes almost an entire minute to boot. I am used to KDE4 which is really quick to boot to the desktop, but with Plasma 5 it is just one black screen after another, with the occasional KDE gear logo or once in a while a mouse cursor. The rest of the time, it is simply wait, wait and wait for the black screen to go away.
A few programs seem to crash regularly. KODI is probably the worst offender. I opened Dolphin the other day to find a while collection of KODI crash .log files.
Overall, once it is running, Plasma 5 is ok. But it remains to be seen if the Plasma team ever bring it back to the nice polished experience of KDE4. Here's hoping.