I actually prefer the newer E63 to the M5 as a daily driver. The 2 cars serve a different purpose. like verbs said, its not the power that's the problem... it's everything else. If you are looking for a sporty car then don't bother with Mercedes unless you're getting the black series. The E63 will handle on par with the M5 according to mags but it feels softer, more body roll ...etc. doesn't give you the confidence you'd expect. It's worlds ahead of the older E55 / E63 in terms of handling tho.