So far, things work quite well and I didn't miss a feature of Visual Studio 2013 yet.
Luckily I was able to upgrade most plugins to their latest version for free so that Visual Studio 2015 support is provided. Plugins I use:
- NCrunch 2.15.0.9
- DevExpress 15.1.6
- ReSharper 2015.2
- OzCode 2.0.0.992
- PostSharp 4.1.23
- Visual Assist 2.0.74
- VisualSVN 5.1.0
ReSharper still shows errors in my Unit Tests although the solution compiles fine and I cleared the caches. I did not yet figure out what's wrong. It's a bit annoying to see so much code in red.
Update: these went away after upgrading the DevExpress controls to the latest version.
Visual Assist and Resharper sometimes get in conflict regarding syntax highlighting. But since ReSharper supports C++ now, the question is whether I need Visual Assist at all. At the moment I turn off Visual Assist.
All in all, I'll stay with Visual Studio 2015 Community Edition.