Packed into its stuff sac its roughly 24cm x 11cm - about the size of the large Nalgene bottle, it fits the stuff sack no bother, not say like a Montane windshirt which has an impossibly small stuffsac. As glynn09 says, packsize is impressive.
The repair kit is a piece of the material, instructions and a tube of glue which i've never used - about 20grams in weight and i definitely wouldnt risk leaving behind.
There are 2 valves, 6 tubes/cells which are all connected as one, so if it punctured the whole lot would deflate (hence why i carry the repair kit). The reason (apart from price) I went for it is when compared to the Big Agnes ClearView is the material seemed much thicker and resilient. It feels more solid than the NeoAir as well, and doesnt have that awful crunchy crisp packet affect that put me off the NeoAir. Its probably not as warm as a NeoAir.
I've used it for about 18 months with no punctures or problem, i dont have any worries about getting a puncture really. It blows up in about a minute with about as much effort as a balloon. I deflate it by opening the valves when packing up which gets rid of most of the air, then slowly fold to force the air out.Its more awkward to deflate than inflate but no big deal.
Glynn09 found it too narrow, but i'm a really restless sleeper and dont have this problem at all.
i feel the cold wild camping, and i reckon April - May, and Sept-Oct time i might start taking a bit of two thirds Thermawrap or my Duomat to double up on my main body. I bet a lot of people wouldnt need this though. I've read about people using the Multimat equivalent at Oc and not feeling the cold, i think that one weights sub 500grams but dont quote me on that.
I'm prepared to sacrifice the extra weight of carrying this as the Airmat/RAB Q250/Air Pillow/Earplugs combo gives me a solid sleep and feel much more prepared for the next day.