I love this thing! I bought a 40 degree one earlier this year for summer use and loved it so much I sold my old winter sleeping bag to buy a second Conundrum for colder weather. The zipper and enclosed toe box make this thing perfectly flexible for me. I sleep pretty hot (especially for a woman) so I usually just leave the bag unzipped and tuck it around me. However, I was very grateful to have the zipper to turn this into more of a sleeping bag than a quilt the one night this summer when the temperature dropped to below freezing overnight completely unexpectedly; I slept reasonably comfortably at 30 degrees in my 40 degree bag.
I spent months debating about which summer bag to buy. I kept leaning toward this one but had a hard time finding reviews from other women. Particularly from fellow women with wide hips who have previously struggled with bags being too snug in the butt area. So I'm providing this information in case there are other women out there also debating about this bag:
I'm 5'8", 145 pounds with a traditional pear shape. I'm a side sleeper and I move around quite a lot in my sleep. I bought the regular length/regular width for both bags. I have plenty of space for me to move around in my sleep without feeling confined and can easily fit some gear in with me, when necessary. I don't find the bag to be snug anywhere; it's quite cozy and I'm happy to be free from getting tangled in a mummy bag from my constant moving. I do sleep pretty warm so I would recommend getting a lower rated bag if you are a typical colder sleeper.