I'm currently wearing a pair of Shimano 132's but I feel the need for more room in the toebox. I've tried various other brands but haven't felt as though they offer enough additional width to bother with. The Sidi site indicates that their Mega width is 4mm wider than their standard width. 4mm isn't all that much but it might be all I need, however, when I ask anybody about the difference between standard and Mega they always say Mega equates to an EE width. That's 2 widths wider than standard or D width.

Anyone with experience care to weigh in? Unfortunately none of the shops around here have a 42 Mega for me to try.

Another other brands out there have wider toeboxes without being true Mega widths?