I have no patience for things that don't work, or are hard to use. So after losing my mind for the millionth time trying to fold up my my cheap "travel" playpen purchased from a big box store, I decided it was time to look for something of better quality. The Baby Bjorn Travel crib is what I found. It's AMAZING. Seriously, soooo easy to pop up and fold away. It also takes up less space than my old playpen did when folded up.
Lets be honest, playpens can't roll away nicely like air mattresses can. But this travel crib folds up in a nice square shape, complete with softcover suitcase which makes for much easier packing. It's maybe about 8'' thick when packed up, which makes for easy sliding under or behind your vehicle's passenger seating.
It is a little pricey. But if you have no patience for cheap crap, if you travel often or need to carry a playpen with you back and forth, THIS is the one to get. (Also good value if you plan to use it for future children!)
The bottom of the playpen is also large enough to accomodate a three year old (if using a smaller sized pillow). So you will use it for some time. It's not only a travel CRIB, but a travel BED.
My only complaint is that the mattess is pretty thin. But I usually just fold up a thick comforter on the floor and set the travel crib on top for extra softness. (If it's going on plush carpenting, then you have no problem.)
Overall, I recommend this to people if they can afford it. And it makes a great baby shower gift if you split the cost with other people.