I bought the Musuc bag lite a while ago and finally had a chance to test it.
Overnight in a hammock on Friday on the Wales meet up with morning frost on the tents. Used in conjunction with a snugpack under-blanket and found despite the 2 degrees temperature I was very comfortable. (I am not a particularly warm sleeper and did wonder if I should have gone for the standard version). I could move around much better than I do in a sleeping bag and getting in and out of the hammock was simplicity itself, not struggling with zips in the hammock.
Pros -
Comfortable to wear.
Easy to put on, just like a onesy .
Fits with no tight or loose areas
The hands can be slipped out through the velcro-closed mitt end easily.
Can move or walk around in it (so night time relief is easy), but I would guess if you bumped into anyone in the dark it could have a laxative effect on them
small pack size.
Price
Delivery from Germany was cheap and fast
Cons.
None really
Slippery in the hammock nylon -on - nylon. Although I think my angle on the Hammock was to blame and a level hammock would cure this.
I would recommend this to anyone who dislikes the mummy bag strait jacket feeling and doesn't mind looking like an escaped telly tubby
Having tried it out it will be my 1st choice on future kayak expeditions and weekend bush-craft meets.
For sub zero or people who feel the cold I would have gone for the standard thicker version (still a reasonably small pack size) I may invest in the standard version as well.
I have absolutely no affiliation to the supplier or manufacturer.