We have two Exped Downmat 9 deluxe sleeping mats exactly like yours and they are everything they are advertised to be. They are very comfortable, warm, easy to inflate with the stuffsack and pack smaller than any comparable mat (and many smaller, less comfortable mats). I used various Thermarest mats over the last 30 years and the Expeds are really that much better. The previous advice about not over-inflating them is correct. It is easy enough to let air out, but there is no need to go beyond about 1/2 inflation. You'll be very happy with them.
Pain in the Butte Ranch