I can share our experience regarding concern no. 3
We have been wanting to test out v9.2/9.3 specifically for the CCM feature. We are currently running live with v9.0.0 and today I finally got around to getting 9.3.1 to test on a different server using a full backup of our data.
My concern was the Licensing requirement to get a Test Server installed with AC. Today, however, I was able to get v9.0.0 installed on the Test Server and then restore a current v9.0.0 backup. As I proceeded to upgrade to v9.3.1 the installer requests a License Key.
- I have clarified with GA Support that you need to request a License key via email (preferably from the account holders email). They will respond back the same day with the License Key (this key is good for 24 hours).
I'm currently running 9.3.1 on the Test Server.
I will add another concern of mine was whether or not having both our Live server and Test server "activated" and online would cause any issues. I was told it wouldn't as long as they weren't on the same network.