I bought two of these to take on hols. Great to pack as light and do not take up much room. Unfortunately one of them sprang a leak the first time of use as the seam was not bonded properly and when inflated - burst!! I managed to use a load of puncture repair plasters to get me through the week to slow the air loss down but seams are difficult to stick to.
I did get a replacement and would definitely recommend them for soft sand or garden use. Only other thing I noticed was that if you lean on the the wedge part, it does put a lot of strain on the seam where it connects to the mat - only time will tell if this is going to tear and I have only used mine for one holiday.