Me personally they always make me a little nervous. I mean I would never atempt to carry my baby around in one. I always thought one would look cute in my livingroom for the baby to sleep in, and later I could use it to store toys. Then I worried about someone not seeing it if I just set it on the floor with a sleeping baby in it and someone tripping and falling on the baby. So ehhh...
I really would more reccomend a sling type carrier for carrying and a bassinet or porta-crib for the baby to sleep play...and there are some really nice alternatives to the travel yards. This one is wood and folds flat, it's really pretty in person: