There has been quite a bit of anticipation over the upcoming BMW M4, and understandably so. A new M is always exciting, and even fans of companies other than BMW are looking forward to seeing what the competition does for the segment. We now have the first spy shots of the M4 in convertible form out and about on regular city streets. The first thing to notice is that it has a folding metal roof instead of a traditional soft top. What are your thoughts on this decision, good idea or too heavy and unsporty for an M?