If you are going to use trainerroad, I see no real need for the KK power add on. Trainer Road power calculation will work.
I have the newest version of the rock and roll and it is very stable. I like it a lot. I had a cheapo trainer and did not like the feel at all. Also I would never standup and use it. With the Rock and Roll I can standup and pretty much ride it like normal. To me not being fixed is more real. I am not sure this is a fair comparison because your cyclops fluid is a great deal better than my cheap trainer. That being said I do not regret getting the Rock and Roll at all.