I upgraded with some GE 6189W tubes that I got from Upscale Audio.
To be honest, I replaced the JJ's early on when I got the Rogue, so I can't take anything away from the JJ's.
With that said, the Rogue is very smooth sounding with the GEs. I am using the Rogue with a pair of Zu Audio Omen bookshelf speakers. I am pleased with this pairing and enjoy it a lot.
The speakers you use will most likely have more of an effect than the tubes. I was originally using Golden Ear BRX's with the Rogue and while I liked it and it sounded good, the Zu's are much more to my liking.
Interestingly enough, I read somewhere (either a magazine review or Rogue literature) that tube rolling was not necessary.
Rich