I would recommend going back when the M3's have a few hundred hours on them. Did the dealer have the wheels or the Mpods set up on the M3s?
Bass is so room/placement dependent, would not be surprised if the dealer just got them in if the set up has not yet been optimized regarding placement.
Evaluating speakers that "that just came in a few days ago" is fun, but is not very meaningful.
They had the mpods on them yes. I didn't know until I arrived that it only came in 48 hours prior. From what I heard that day I would not be convinced to switch speakers but maybe that will change after a month.