IMHO, I think ZPacks, EE and Katabatibc all make great quilts, but with different ideas in mind. Katabatibc is more of the high end, all the bells and whistles and a high price tag, whereas ZPacks and EE are not so much about the bells and whistles as much as focusing on a more minimal set-up. Of course, there are variations within each company… So none are exactly one and done.
I will say that I own 2 EE quilts (both synthetic), 1 HG quilt and 1 ZPacks quilt. The ZPacks quilt is the newest addition. I opted for the standard 20F in a long and wide. I am 5’10” and 172 lbs, and wear a size 12.5 trail runner. I generally start out the night on my back, but as I get closer to drifting off, I roll over on my side and usually sleep on my sides during the night.
The long ZPacks quilt comes up to my nose/ears when lying flat on my back. When I cinch the cord down at my neck it comfortably fits on the top of my shoulders. My feet are close to the end, but not so much that they are pressing into and compressing the down in the foot box. Of course on my side, there is no issues with length at all.
I was hesitant to go with the zipper, but I figured why not. Now that I have it, I think I like it. I can zip it up and crawl into it like a pair of pants (feet legs first, then raise my hips and pull the bag over my hips, then sit up and pull it over my shoulders. When zipped I am not too confined, and I can still wear my MB EL Anorak while lying inside the zipped up bag. The zipper is not very noticeable, especially if I am wearing a couple of layers (which I would be anyway since this is a 20 bag, so it would be cold outside). I will say I am not to excited about the plastic buckle at the neck. I can feel it on my neck when buckled closed, although, I can rotate the opening just a little to move the buckle from behind my neck.
The foot box is nothing special, simply an envelope design. While I will admit, it is not as comfortable as the trapezoidal foot box like on my Marmot Helium sleeping bag, I can’t say it is uncomfortable either. It forms a box for my feet to rest in, and keeps it warm.
If I were to order it again, I would go with the same size (assuming I were sticking with the 20 F bag – if I were going for the 10 F bag I would probably go 1 longer just in case I did want to stick my head inside the bag, which I never do). I would definitely keep the zipper (IIRC, it’s only an additional 0.6 oz) I would be up in the air about adding the draft tube along the zipper though… I do tend to turn inside my sleeping bag, which makes this bag really awesome for me since it zips up like a bag, but has no hood to get in my way, however, if it ever did get turned any while I was sleeping, cold air could sneak in through the zipper.
I considered going with the strap attachments so I could add an attachment point to my sleeping pad (which is how I have moded my EE quilt), but if it gets cold, I think I would prefer to simply zip it up and stay inside. This would make the straps unnecessary. And for those less than cold nights, it is very easy to open this quilt up and use as a quilt.
Hope this helps some, and good luck with your decision…