I used a pair of A3s for almost two years, and loved them. They are spoon-shaped, but if that's the shape of your foot, that's an advantage. The fit guide is spot-on, and the heat molding really works. With aftermarket insoles, I never had a pair of shoes that were so comfortable and supportive right from the first ride. And I could ride with looser straps. The tub sole is ridiculously thin and stiff, even on the cheapest models, and the fit is the same across the entire line.
There were drawbacks. The cleat nut grommets turned inside the soles as I was refitting Speedplay adapter plates, and I had to hold them in place with a pin spanner when attaching cleates. These are right under the insole, so they are also thermal conductors. They weren't a problem in the heat, but cold days were colder. Then part of the upper ripped and came unglued from the tub sole. This was easy to patch with Gorilla Glue. No big deal.
I gave up on them after the edges of the soles wore through, and found a pair of Shimano R170s that fit even better. If the Shimanos ever give me a problem, I'd go back to Bonts in a minute.