My best friend has one and she will soon be shipping it over to me since her baby is finally outgrowing her car seat.
She loved it. She said it was just so easy for quick trips here and there. And depending on what car seat you have it could last a while. We have the Snugride 32 and have heard that it will hold some babies all the way to 1yr.
My friend had the snugride 22 and her baby could still fit for a little while longer if she needed to. Now her baby is 8 months+ and she has started using the Maclaren I got her for her baby shower.
We were totally excited about this product, but have voted against it for 2 reasons...
first...my cousin has one and had to replace the tires because they wore out after 4 months.
second...the sample in the store was already peeling (foam like material) on the part where you snap the baby in. Once this wears out and falls off, the seat is not longer secure because the foam gives it a tight fit.
We have one and we love it. Super easy to fold up and lift. My only complaint is that I don't think it's the smoothest ride, but we only use it for going shopping, restaurants, and short walks.