Bought two of the "2 Second" Quechua tents from Decathlon in 2005. Two reasons - Firstly, they're ideal to sling in the back of the Land Rover for long holiday trips that need an enroute overnight stop - no need to put up the main tent and, last year, four of us arrived on a campsite at around 8pm - the tents, mats and sleeping bags were out and up ready to crash in within 5 minutes and we were heading off off to a restaurant/bar for a meal and the inevitable beers. Secondly, they were bought for Le Mans, as one of them fits in the boot of the MGA and takes up less useable space than a traditional tent. Same deal - arrived on site, tent up with in seconds, kit sorted, beer opened within 5 minutes. The only reason I didn't get the larger one (that has a bit of baggage storage space) is that it won't fit in the boot of the MGA. They have been subjected to plenty of rain and wind, and they are robust and waterproof (although as one of our number found out, one end is not particularly waterproof when you leave the tent flap unzipped).
Setting up is dead easy - release the elastic band and let go. Putting away is similarly easy once you have mastered the knack of it, which takes about two or three goes (reading the instructions does help....) Overall verdict, bloody good value, lightweight, very easy to use, and very convenient. Top bit of kit.
MG Mark