i don't think there open on sat but practice from 8 - 11 on race days (sundays).
yes they have transponders and accept personals.
classes are:
touring stock, super stock (13.5 brushless), 19 turn (check point money motor) and mod, also a F103 class.
it's a very friendly, fun place to race, and lunch is included for racers
you can find more info here:
http://www.rcracingextreme.com/forum...er=asc&start=0