Any of you have experience with these? Will be selling the X5 soon. Considering a CPOd 540iT or S6 and possibly even 05/06 4.4i X, etc as a replacement. No one in my family really digs the E60, esp the interior. There really aren't many S6s around to test drive, so I'd like to know whether this would be a vehicle woth considering before looking for one to take a spin in.