In 2007 there were no Q-40 or Q500 races here at all.
There is a good chance that Q-40 Sport could become a normal event in 2008. It will really take someone promoting it to become popular.
I flew Q500 back in 1983 and 1995. Those events became popular in the area after someone took the lead and promoted the event. I am hopeful that this will happen with Q-40 sport.
I see the biggest advantage to the sport class (either Q-40 or Q500) is cost. A glass kit can be built for about half the price of a composite kit. Assume around $300 for the the Q-40 model. A TT 40 is available for around $85. Compare $385 plus radio for a Q-40 Sport compared to a composite Q-40 with racing engine.
I believe 2008 will be the deciding year for this class. At least for me, I can afford $385 but it is unlikely that I would spend $1000 to $1500 to see if I liked it.