Buy them. You won't be sorry.
I have had a pair for three years. Fit like the proverbial glove. I tend to take long rides (all conditions), and these always perform well. Prior to the bibs, I wore shorts - but I am not going back to shorts. The padding is excellent (and very durable). I own a pair Assos FI.13 S5 bib shorts also, believe Assos and the catalogs when they say the Assos FI.Mille S5 Bib Short are for long distances and the Assos FI.13 S5 are for short distances. The 'suspenders' are wide and very comfortable, as is the mesh back.
After hundreds of hours of wear and many washings, mine are showing some minor wear. After the Assos-supplied detergent ran out, I started using Woolite in a cold wash. I always put the bib shorts in the mesh wash bag. Yes the shorts are pricey (and rarely seem to be on sale), but it is money well spent.
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