We have been using it for a little while. Seems stable and fast. Really enjoying it.

I've moved a few projects onto php7 with no issues. If you're running on 5.6 the upgrade should be pretty easy.

In custom applications of course, but most extensions for shop application uses ioncube and that is not avaible for php7 :(

I am, and I'm loving it. It is really fast. Combined with HTTP2 and NginX, this is the fastest PHP setup I've seen in a while.

Yes, about a dozen sites / services. No problems, super fast!