If you want a criticism then you can have one:
I think that the RTB service is a little more hyped out than what it actually is. I think people are a little jumpy because it looks pretty cool and it is some competition to the biggest blockland server hoster, and the forums doesn't really see that a lot.
Both Kaphost and RTB hosting have had connection issues and I have seen both Lub+Ephialtes and Kalphiter acting like little kids fighting over whose service is better. This fight was started by Lub+Ephialtes but Kalphiter was not innocent when he helped drag out the drama.
In the end I would side with Kalphiter because his service has been around significantly longer, and he doesn't have an egotistical attitude like the RTB team.
Kaphost: 7/10
RTB Host: 5/10