I am testing out a RSB setup right now. So far my experience has been 3/5.

I have the "Quick" Plan and here are the server specs:

My Location	Western Canada
My Connection	150Mbps/25Mpbs
Server Location	Somewhere in France
Server Connection	1Gbps
CPU	Intel(R) Xeon(R) CPU W3520 @ 2.67GHz (PassMark Score: 5059)
RAM	4 GB
HDD	1 TB
Root Access	Yes
Software Running	Quickbox, ruTorrent/rtorrent, Plex, Ombi, Sonarr, Radarr, and Jackett

Speeds
We have 3 major ISPs here in Canada. When I ran my speed test from my RSB server it was extremely strange. ISP2 and ISP3 were showing "ok" speeds but ISP1 was bad.
Speed Test

Plex
Plex streaming is good if I ask Plex to transcode my 1080p films to a 10 Mbps streams. I can't run Plex movies on 11 Mbps or higher without getting buffering lag. I am the sole user for Plex but with the CPU I can support two 1080p streams simultaneously given the CPU's PassMark Score. When I am doing a single 1080p encoding the CPU barely hits 2.4% usage anyways.

ruTorrent/rTorrent
I have to concur with @Christ Respawns that the ruTorrent interface is slow but that is because of the connection. Bad peering to my ISP. Having two lines to my house I switched to the other ISP and the interface loads much faster.

SSH Console
There is some lag when you type or interacting with the cursor on the command line. It is not considerable but you do notice it.

Customer Support
Sweet baby Jesus is it ever quick. Props to them. They accidently charged my account yesterday because of an unwanted invoice I had by accident. Between my email, cancellation, and the refund, it took about 7 minutes in total.

North American Servers
Their "Stream" line of servers do have some locations in Canada which are currently all full based on the email I just got. They also kindly offered me in an email saying that if I upgrade to their "Stream" line they will automatically move me over as soon as a server in Canada becomes available.