I am on the Jamroom hosting now. The switch-over of my live site ( http://indiegospel.net ) was relatively easy and uneventful.
I had my maintenance screen up for 20-30 minutes while we re-issued and installed the SSL certificate and the DNS resolved. Had to remap my profile domains as well, to the new server. (eg. http://kenrich.me )
Live speed tests outperform my old server by roughly 50-150 points (and it had 8 cores and 8 GB of Ram). New scores are generally high 900's on average, breaking 1000 occasionally.
This is on a "live" fully loaded 50 GB site, with almost all currently available JR modules running.
Sometimes at the old host, my performance dropped down to the 300 range (even worse when there were rare issues like cron jobs stuck). Since I am not sharing the JR Hosting resources with other users, I should be able to get consistent high speeds, and so far that's what every test shows.
Also, as a test of the conversion server, I converted a 257 MB WMV file in 608.29 seconds.
In addition, I was very pleased to discover I can redirect a domain from Go Daddy, to a stored HTML website folder, and have a working website (which isn't a JR5), running from the JR Hosting server.
An example is http://indiegospelradio.org which is a multipage radio station. It is running from JR hosting and not through profile domain mapping.
Though extremely simple, the procedure I'm using is not supported (so don't try this at home kids - lol).
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Ken Rich
indiegospel.net
updated by @ken-rich: 03/25/15 10:17:25PM