Anyone with the Brooks Bros. version of 5-last shoes care to comment on something here? When the shoes were new, did you experience a sensation of your foot sitting higher in the shoe due to the Poron insole, and as a result, slight heel slippage compared to the normal AE shoes? This is precisely what I'm experiencing with my new Brooks PAs that I got during the current sale. They fit and feel fine, but there is slight heel slippage. I'm wondering if this will go away as the shoes break in. I'm thinking it will, since a) the soles will soften up and become more flexible, and b) the Poron insoles will conform to my feet, and my feet will sink in a bit. At least in theory.
I have purchased the Brooks Brothers versions of Park Avenue (black), MacNeil (chili pebble), and Strand (black, brown, walnut). I bought the Park Avenue in 9.5E and had no heel slipping, just a little wide and putting in a thin insole helps with that. The Strand shoes and MacNeil from Brooks Brothers are all 9.5D and all fit nicely from the get-go. I do not recall any problem with the heel slipping. From the get-go, the Poron insoles have felt comfortable to me. It may be that my feet have imprinted into them but the shoes pretty much feel the same to me as when I got them. Based on my experience, I cannot say whether ones feet sink into the Brooks Brothers shoes or not. As you break them in, the shoe will flex more and that MAY help you reduce or eliminate the heel slippage. Good luck! I find shoe fitting to be stressful also.