Now I don't doubt that most up and up newbie parents get Snap and Go somethings. Why not? From shopping cart to car seat to dinner at in-laws to car seat to house nap. The little kid doesn't get bothered.
It is a matter of convience. With twins it's a matter of necessity. It allows one parent to attempt to get around with the tykes. TThrow them on the single file double and go. In and out of day care is a breeze.
Ah, but savior the moment. Once the out grow the Snap and Go is a challenging time adjusting to the new waya. Just when you had the system down, thrown from the groove and time to learn a new system.