Oups... I thought you meant these....
That's okay. I replied before you put your picture up, wondering why you wanted two straps
So, the advantage is a wider spread of the pressure. That right? Any other reasons?
I'm asking out of pure curiosity, but also because I'm going to have to order some clips from overseas because you can only get plastic here. If these are a better unit, particularly for someone with wide feet like me, I might get them instead.
Then there's the issue of pedals. Again, decent ones aren't available in the shops though you do get an interesting collection of patronising looks.
Richard