I have the Hyperlite and the DJ XL and really like both. I will use my Hyperlite for backpacking and the DJ XL for car camping and short hikes. I like the DJ XL better than the Hyperlite, because it is more versatile with the double layer. I also like the size of the DJ XL better, but the hyperlite is still very comfy.
I have the HHSS for both sizes and use it with an UQ when it is cold. I like to protect my UQ, and would get an UC if I didn't have the HHSS already.