All around a great underquilt. Warm, lightweight, easy to use, high quality, great price, and versatile.The warmth surprised me. On my first use I doubled the underquilt with the Onewind attachable quilt and used my Hammock Gear down quilt over top. This was overkill on a night in the low 40s F. Since then I have used the underquilt on it's own with the Onewind quilt over top of me, and I expect to use this configuration until fall when night time temps get into the 30s F and beyond.Perhaps the greatest pro to this underquilt is the versatility. It is easy to adjust and can be left loose for warm nights or tightened to your body for cool nights. With the Onewind quilt it can be adapted to cold nights. The design can accommodate all types of hammock sleepers, whether you lie straight or diagonally.The sides of the underquilt rise up above you in the hammock, effectively insulating you on 3 sides and blocking out all wind. I have used this underquilt on nights with a bitter cold wind coming off the lake and never felt the wind except when I poked my head or arm up above the underquilt.Negatives are few. The cords are many, and they can get tangled around each other while hanging the hammock. This effects the ease of adjusting the underquilt a little bit, but mostly it sets off my OCD and I have to straighten them out. Straightening them is simple enough though, and then the underquilt is easy to adjust even from within your hammock. The stuff sacks is a perfect and tight fit for the underquilt, and there isn't any extra room in there. The sack has an opening on each end for convenience while hanging, but I find it is easier to remove the underquilt from the bag completely so that I can straighten out the cords. I am considering buying or making a bigger double ended stuff sack so that I can fit both the underquilt, Onewind quilt, and hammock all together for a quick, one-step hang.I wholeheartedly recommend this underquilt.