After having my Bontragger Nekko bike mangled by TSA at an airport, my husband and I discussed getting folding bikes we could put in a suitcase for travel or for in our own plane. He also wanted to take one to work to ride on nice days during lunch without the bike rack on the back of his vehicle all day. So he ordered on for both of us to try:Citizen Gotham 24/7.
I can easily lift it at 30# to take out of the trunk of my Chrysler 200. It fit, but I can't have much else in the trunk with it. It came with a carry bag and my hubby bought the bags for $25 for the set on sale. The easy latch/release system is manageable for anyone, even with arthritis in hands. The tires are a bit smaller than those of my regular bike, but not bad.
I took it for a 40 minute ride in town. There are only 7 speeds, so it is much different than mine with 21 speeds. The gear shift rolls instead clicking a small lever. That's something you might have to get used to. The pedal strokes will be 1-1/2 to 2 for every one of your regular bike. The ride with shifting is smooth, but the brakes are touchy. If you want to stop, you WILL stop! While riding, I was totally upright, rather than slightly bent at the hips leaning forward toward the handlebars. I would say it makes a great commuter/fitness bike, but if you want to ride distances or hills you may be disappointed.
It would be a great bike if you live in an apartment with no real space for a bike. We bought it to take in a private single-engine plane or take on commercial flights. It should fit in a large suit case. Students in dorms may like it because they don't have to leave it outside. You might like it to take to work with you to ride at lunch like my hubby does. Campers would love it because they won't need to put a rack on the back of the camper. The website has a lot of other reasons someone might want a folding bike.
When I folded it back to put it away, it was really easy. There is a small stand just under the pedals to hold it up while folding/folded. I folded it, picked it up, set it inside the bag, and zipped it up. The one important note is that you need to know where your handlebar is. Keep it on top when placing in trunk to avoid damage to it and gears. The gear and rail are protected well, so no worry about damaging them loading and unloading. It was a breeze! I would recommend this one for travelers and anyone who either doesn't have space or doesn't want a bike rack. It is a great ride for bike fitness enthusiasts!
There are other folding bikes at Citizen for different purposes. Check them out at http://www.citizenbike.com/default.asp.