I used to wear the Linds Exxxtras in a size 11EE for a number of years (10?), the same size as my Rockports and New Balance shoes, sneakers, running shoes. Over the years I gained a little weight and my shoe size went to an 11 1/2. That is the size I got in 3G's Tour Ultras, about 2 years ago, when I went to replace my Linds. I have been able to use the 3G's without needing a wide version of them. I think they are made a little wider than a true medium, either that or the Kangaroo leather is much more flexible than cow leather.

I wear heavy winter socks in the 3Gs. When I wear thinner summer socks, they seem a little loose on me.

I've heard 3G's in the past haven't held up too well compared to the other high performance shoes on the market. Is it because the Kangeroo leather is too soft? Mind you I heard this like 6 yrs ago and I would imagine they hold up much better than shoes past.

The Tour Ultras I believe are the only ones that use the kangaroo leather.  I could be wrong though.  When I ran a pro shop full time about 6 years ago, I believe there was an issue not only with the toe caps; but also getting replacements.  I have not heard any issues since then; especially considering how many threads there have been over the past year or two about which should are the best out there in reference to comfort. 

I went from Linds Exxxtras size 9-1/2EE to Ultra Tour size 9-1/2.  Seems to fit good, maybe the kangaroo leather does stretch more.

Only issues I have had in the two years I have wore them, the shoelaces only lasted a year (seems quick for only wearing the shoes for a few hours three times a week) and one of the metal shoelace holders broke when I was tying the shoe once.  I had to do a quick repair with my Leathermans but I don't know how long that will last.