Picked this mat up as a winter sleeping mat and it's done the job through many an expedition and many seasons. Its dealt well with rocky bivvies, emergency bivies in the rain (!), tent and tarp work come wind, snow, rain or shine! Lovely and comfy, low pack size and a reasonable weight for a mat of this season rating; and at the price you can't complain!
My valve has given up the ghost after over a year of use, so it now relies pretty much purely inflating with lung power, which is a bit of a let down but nothing major, and no different from any other major brand self inflating mats i've used. Highly recommended!
(Given four stars thanks to the valve.)
Great stuff, will certainly buy again when the current one expires!