Spot on. Great for people looking to compare the two. I gave the M550i a quick test drive because I was impressed with the LCI (honestly, when does BMW do a bad LCI?), and thought I could get most of the performance of the F90 for a discount, but they're just too different. As of now, I'm still on track to order an F90 in the Spring.
I'm not sure what I expected, as I went through this with the 335 and M3. The M550i is a fantastic car, but it won't scratch the itch of an M if that's what you're used to, or what you really want.