I have the F30's in a wide, narrow room in my townhouse. The room size is 30 feet wide by 12 feet deep. I cannot place the speakers at the end of the room like I would want. The speakers are about 2 feet from the wall and toe'd in. This is the best I can do. They need a longer room to get the soundstage and depth they are capable of producing. They sound great but, I know they would blend together much better in a longer room. (I've heard them in a longer room; they were much, much better.)
I would have bought the M20's if I were going to live in this house for a long time. However, I'm moving in less than a year to a house with a bigger listening room. These speakers are perfect and I did not want to pay for M20's now and then upgrade later.
I think you will be very pleased with these speakers. Once I heard them, nothing else was good enough.