GO Recommended Product
Used a few times now on short overnight camping trips on Dartmoor with a bivi & tarp setup (fast and light). Compared to a previous cheap self inflatable foam type mat, this is in a whole other league.
It is fairly expensive but it's definitely worth the price, benefits include: it packs small, it's lightweight, comes with a dry bag that doubles up as a means to inflate the mat in ~2mins, very comfortable to sleep on, open cell construction really does adjust to body shape and weight, nice and warm (insulated), easy to tweak pressure with simple but innovative valves, comes in a large variety of choices.
So far I have found no substantial downside to the mat or its dry bag/pump accessory. Time will tell how good its long term durability is, but I have high hopes as S2S make some excellent products!
*Disclaimer: I am a staff member from Plymouth Store, however I have written this review of my own accord*