The mini e-revo is too fast for indoor use. Trust me I've broken ceramic things all over my house, even managed to knock the Freddy Kruger glove off the wall in the war room!
I got the MERV cause I liked the fact that it doesn't take up a whole lot of space, I do a lot of camp jobs, so most of the winter I sleep in a 10'x10'x8' room with the smallest wall mounted flat screen you've ever seen, a closet that can hold maybe a weeks change of clothes if you force them to fit and a one person dinner table. So after I have some clothes, boots, and winter gear there isn't a bunch of space left, that's why I needed the MERV to take with me.
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Brushless is suppose to have less to maintain, no brushes no rebuilding the motor after your done racing, and it seems that brushless motors can make more power with a smaller can/body.