Phil&Teds Traveller

This is the only genuinely portable travel cot that I have found. It is very light and folds up very small. I found it quite easy to put up the first time and now it's an absolute breeze. I was concerned that the mattress sat straight onto the floor which might make it uncomfortable. My baby is a very good sleeper anyway but we've had no problems with using it at all. The only downside is that it is reasonably expensive.

It's very difficult to put up initially, after a couple of times you get the hang of it. However, we didn't use it any more than a couple of times as it ripped. I got my money back but, I wouldn't advise anyone to buy this travel cot

This is a great little travel cot. It is light and folds small enough to be packed into a suitcase and taken on a plane.
It zips up into a box so it keeps mosquitoes, flies and creepy crawlies of all sorts out. But it is big enough to use as a regular cot, so it doesn't feel like a little tent. Also the top bit zips right off, so when you don't need to keep out bugs, it can feel more like a regular cot.
Also, it's handy that it can be opened up from the top and/or the side. So we unzipped the side and let our little one use it as a cubby house so that she could get used to it before we went away. She actually sleeps in it better than her regular cot as it has all soft sides and she never wakes up from bumping her head/arms/legs against bars.
We bought this for taking to India & USA and for travelling around in a motorhome. It was great for keeping out elements in India. Easy to fly with, and we could put it anywhere in the motorhome (even on the bed over the drivers' cab area) because we could unzip the side to put her in.
It isn't as easy to put up and dismantle as some of the bigger travel cots. We had to read the manual to put it together the first couple of times, and even now, I sometimes start to put the bits together in the wrong order and have to go back and start again. It's almost as fiddly to pull apart.
Overall though, we've been very happy with it and it seems to be a quality product. We're just about to go away for 6 months using this as the main cot, so lets hope it holds up as well as it has so far.
Oh, and it comes with tent pegs, so if you use it outdoors, you can peg it down. I don't think I would ever use that, but I guess I'm not the camping sort.