I bought these shoes for my toddler, and I love them! They are darling, and I love the rubber sole.  It has a lot of traction for slippery, wet, snowy days.  I will probably spray them with a leather waterproofer to make sure they last well all winter.  I haven't had any problems with the zipper.  But the sizes run BIG.  I had to send my first pair back and get a smaller size.

One month later:
Yes, I sent the first pair back because it was too big (I ordered the size my daughter normally wears). But the smaller ones were too small. I could barely get them on, even if she wasn't wearing socks. So I sent them back for the larger size, which I had originally purchased. They fit okay, but are still a bit large. But at least I can get them on. At first I didn't have any trouble with the zipper, but the more she wears them, I can see that the zipper does not stay up. The shoe stays on okay, but the zipper unzips itself throughout the day.
If these shoes weren't so cute, I'd send them back. But I just love the way they look, and I love the color.