They are SO cute on our chubby little baby.  He seems quite comfortable in them, and like all Robeez, for the most part they don't fall off, which I love.  They also wash quite well - a necessity for us because he spits up quite a bit.
I gave these only 4 stars though because although the "fur" lining is quite plush and soft, the booties do not seem to keep his feet at the right temperature.  His feet are always a little sweaty when I pull off the booties and at the same time they also feel a little cold.  Layering them over socks doesn't work because then the booties fall off much more frequently.
I also did not give a 5 star rating because the booties seem to be sized a bit small.  This is due to the thick lining.  I have compared them against other Robeez in the same size and the length and width IS the same, but the fit is smaller.  My baby is now only 7 months and his toes are already touching the front seam of the booty.  (We bought the 6-12 month size.)  I really like the look of the shoes on my son, (they are adorable) but wish they were sized to accommodate for the lining so he wouldn't have outgrown them so fast.  I don't know about you moms and dads out there, but I hate spending $35+ on something to only have it last 2 or 3 months.