I have a brushless setup in my 12L4 and love it.
You can go so slow with brushless, or silly fast. And for practicing, one nice thing is my transmitter (Futaba 3PM) has the option of setting the maximum throttle. A friend and I often have some driveway racing fun, and we often run the same motors, but sometimes I have a brushless motor in and he has a brushed motor. All I have to do is reduce my max throttle (in this case, to 48%) and our speeds are the same, yet of course the run time is awesome with brushless. I love having the option from easily switching from brushed to brushless
and having reverse is a nice bonus too!