Rating: 4 / 5
My review is for the newest incarnation of the PLQ pants which use Pertex Microlight for the shell instead of the lighter Quantum.
Firstly, I bought these from Prolite Gear under the impression I was getting an 8-9 ounce insulated pant with Pertex Quantum shell so when I received 11.5 ounce pants (size medium), I was a little miffed. I decided to keep the pants in spite of the extra weight. Microlight is more durable than Quantum and it's supposed to be more water resistant as well.
The good news is that in the field they work well. They are indeed quite compressible and warm. The fit is excellent and on one trip I was wearing trail runners and runnign shorts, I came up onto a chilly ridgeline for a rest stop and put on my down jacket and my PLQ pants. It was nice to be so warm after a chilly day of hiking. In camp, in a sleeping bag or a quilt, these are super warm and comfortable. Wearing a down jacket, PLQ pants, insulated booties and mittens, there isn't even much need FOR a sleeping bag.
The bad news is that with the extra weight, it's not really practical to take the extra garment to bolster a sleep system with either a quilt or a bag. I made lists for sleep systems using this, a number of jackets and other insulated garments and each time I came up with the conclusion that an 8 ounce pair of fleece pants, or a 3.6 ounce pair of silk long underwear, in addition to an adequately rated bag would be the lightest, and lowest volume option. The PLQ pants do compress fairly small, but high loft garments always tend to be harder to compress than just clothing. Not only that, but synthetic insulations simply shouldn't be compressed too tightly because it will damage the fibers, so the fleece pants turned out to be the better option for me and I ended up selling my PLQ pants.