I ordered these for my 16 month old son.  I ordered size 6.5 but he's probably about a size 5.5 currently.  So he has plenty of room to grow.  The way these shoes tighten is better than traditional straight velcro straps.  I am able to get them nice and snug and my little boy has no problem running around in them, even tho they are a little big on him right now.  His heel does not lift up or anything. I can't really speak to durability since he's only had them a few weeks.

Overall I am very happy with these.  They also seemed to be decent price, right in the range of most other shoes I looked at.