[Alan l.]

Coming from a M3 myself i can't say i've ever felt my X5MC feeling slower in any circumstances. One thing that i do notice is that the transmission setting has a dramatic impact on how eager the car is to take off. In D3 with the transmission in Sport+ its pretty immediate. Not M3 immediate but I don't think any SUV would be. If the transmission is in D2 and engine in Sport I do feel i want a little more responsiveness so my daily setting has been trans in D2 and engine in Sport+. Keep in mind no X5M/X6M or even the M5 will feel like your M3. Wasn't designed to be and never will.

As for roominess i can't comment about the X6M but the X5 is massive compared to the my M3. Not so much legroom space but more so width, shoulder room.