How long was your test drive?
M550i is a great everyday car but it will be different than your F80.
M550i with sport plus engaged will shoot from 0-xx like a bat out of hell but will fall off toward top end of RPM, where M3 has just begun to sing. I am comparing to ESS tuned F80 btw.
Though, It is hard for me to pick between M550i and M3 and I ended up driving M550 (8/10 times). That being said, M550 wins for everyday use.
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