Well, if not defective

Have 3 of these mats for a camping holiday (tents) bought.
Mats have a pretty big pack size, thus only suitable if you are traveling by car.
The self-inflating actually works really well only the first time, you have been strong in the next missions help out so that enough air is splashing around.
For chairs, the mats are really good, are large enough (for tall people) as 2m long, no one (not even with side chairs) suppressed despite the 3cm thickness to the ground through the mat and makes no unpleasant noises during movements.
If that were all there is to report would wärs eignetlich quite positive, but ...

with me the mats were purchased 3 2 broken after a very short time.
The first right the first time aufblasen- apparently did not consider the "inner bonds" of the mat and as a huge bubble was created on one side and the mat was therefore unusable.
The second was leaking after 4 days at a seam adjacent to the valve, so that the air after inflation escaped nice and slow and thus was also useless.

If you get a mat having the none of these shortcomings, then you think I made a good buy, in my case, wars only one of 3 that.