I have one of these too and for the price, it is a cracking piece of kit.
The outer shell on its own is a roomy and a half decent bivvy bag, the inner blankets keep you very warm and take a bit of the edge off hard ground.
It is an awkward bugger to carry though, especially if you add a self inflating mat to the roll for comfort.
Now it is getting warmer, I've swapped out the blankets for a
jungle bag I picked up at a surplus shop. Taking out the sleep mat, it now packs down a lot smaller and is a doddle to carry.
Having reduced the carry size, just to make life interesting, I have also picked up a
polish army sleep mat, which is big, heavy and another awkward bugger to carry, but does fit in the outer shell and imo is the most comfortable, if least practical, sleep mat I have ever used. I'll not be using this mat on my hiking adventures (unless I can find an XL compression sack and go minimal and ultralight with the rest of the kit I'll be carrying) but it will be ideal for a few forthcoming meets I will be attending.
If you are interested in this mat along with the roll, Military Mart are selling both items as a
military swag bag
Good Luck.