I ordered the wide sizes because some standard size shoes are narrow for me. I wear between a 12 - 13 in athletic shoes. I chose a size 12.5 wide. The wide size is really room and a little wider than expected. However, it's ok for me because I used them for marathon training and my actual marathon. Also, after hours on my feet from running, my feet swell and it's better for me to have roomy shoes with wide toe box than narrow shoes. These shoes felt great for my marathon until after mile 23. Not sure if it's my fatigue starting to feel overwhelming after mile 23 or what...; but I'm sure most normal people who run 23 miles and more usually don't feel that great anyways.As for stability goes, the shoes are really stable. The guide rails really do help your feet stay in place. My feet pronate inwards and thus, the guide rails are good in stability. It feels like you're on firm springs. Guide rail padding is firm and may take several weeks to fully break them in. These shoes aren't going to be really cushy and soft. They won't feel soft like Skecher's cloud foam shoes or flexible like Nike Frees. It took me about a month to break in these shoes and for them to be comfortable. I used these for marathon training and my runs are 2 - 3 times a week of about 3miles - 8 miles per run. After a month, I felt comfortable to run over 10 mile trainings.After these shoes are broken in they are comfortable for those that stand and walk on their feet for long hours a day.Overall, these are good stability shoes. They look like they're built for long lasting. The cushioning underneath is really padded and good. Except they'll take awhile to break in. Unfortunately after 5 months of training; some parts of the bottom of the shoe started to peel off because I heel strike a lot. However, I mainly use them for walking and light running and they're still ok.