I hear mixed reviews about GKR. A friend of mine was a yellow belt when he was handed a Black belt with a white stripe and given his own club to run! That says it all to me really.
I have trained in Shotokan for 12 years. Availability of Karate clubs in my area was more the reason I started training Shotokan. I also trained in Wado Ryu up until Green belt before I joined the Army in 1994, after that nothing until starting with Shotokan in 2003.