I wear AXO's RC-5. I think it's a great boot. I have a normal - to- narrow width foot and I have to wear the buckles as tight as they'll go. What this means is that if I had a wide foot I could wear the boot no problem.
Also, since the RC-6 just came out recently you'll soon be able to find the RC-5 at a discount.
i have the same problem i have a size 11.5 and they are double E i heated them up in the oven a littly bit and then put them on with 2 par of soxs it worked for my feet