I've seen a lot of these recently, and here's the word from the moms:

* They run small.  "0 to 12 months" fits best from 3 to 9 months (or even 0 to 6 months).  "12 to 24 months" fits best from 9 to 18 months.  They make them in larger sizes, but I don't know anyone who has them.

* They're expensive.  I don't usually spend $5 a pair on my own socks; do you?  On the other hand, these were usually received as a gift or bought used (try that big online auction site, or hit the garage sales in an expensive neighborhood).

* You have to buy a box of six different colors, and some of the colors aren't very useful.  This kind of basic set isn't as awkward as some of the multi-colored ones (how many outfits do you have that want bright-blue-and-sage-green socks?), but everyone had a pair or two that languished in the bottom of the sock drawer.  Moms would prefer the option to buy a smaller set that has just the pink and the white, with maybe one other color (red, green, and purple seemed popular.  Personally, I think a "Valentine's set" of three socks in white, pink and red [or purple] would be good.  You could buy half as much and only get useful colors).  Also, in this set, the "pink" and the "purple" are hard to tell apart.  The real purple is in the "bright" set.  This one gives you a slightly peachy pink and a rather pinkish lavender.

* If you have a lot of hard floors, then the rubber grippy stuff on the bottom is great for the toddlers and even for the little ones who are just trying to pull themselves up.  If your home is wall-to-wall carpet everywhere, or if your child is always wearing shoes, that won't matter so much.

* Turn them inside out to wash the first time or two.  That will reduce the amount of black fuzz that gets between your baby's toes.  The ones with patterns on them rather than being basically solid colors produce more fuzz.  Also, you can reduce the odds that they'll get lost in the laundry if you zip them into a lingerie bag.  Then they can't crawl up your pants legs or get tangled into the corner of the bed sheets.