My sit bones measured slightly wider than 155mm, and I've been riding the Toupe for a couple of months. So far, so good, although it has felt slightly less comfortable since my pro bike fit. I think this is due to more weight being back on my sit bones; there isn't much padding on the saddle. More seat time should make that go away eventually.

You may want to check out the Romin as well. It comes in the same widths as the Toupe but rides slightly narrower according to my shop.