I did not dare let SWMBO see the Amazon invoice for this little (??) beauty.... I call it 120 quids worth of luxury!
79x203cm, thats 31"x80" in old money and it's 10cm thick, so maybe not that small in reality. Weight is 2.7kg, so not too awful compared to an XL single airbed that I had been using before for 2-3 years.
The reason I decided to go for a self-inflate was warmth on cold ground and the Mondo is wonderful and the thick mat gives a great nights sleep, no sea sickness and yet thick enough to avoid hips touching the floor.
The mat is big and so needs a long time to self-inflate. I recommend get the tent up, then unroll the mat and after 30-40 mins expect to need a couple of puffs to complete the inflate. I am larger bloke, 6ft and about 14stone and find I need a bit more air in the mat for a comfy night. At the other end of the day, the mat has two valves which helps deflate the mat, I have found it OK to do, other Reviewers complain it is hard work, but I simply roll it up steadily, keeping my knes on the mat to squeeze all the air out with each rotation. About 2 minutes work, the pop it into the bag.
On a bike, the rolled mat is BIG, mine lives in a 60l bag along with sleeping bag, pillow, seat etc and some cooking gear. This is a bit of a monster on a small trail bike, but works for me... just. :-)
In all honesty, it is a mat better suited to a car, but if you have the room AND your tent is big enough, you will get a great nights sleep on this mat and while I know there are many that are happy to spend a night on £20 worth of foam or cheap mat, the Mondo really is up there with the best in beds. For me a good airbed is the only thing that comes close.