Jerry, your timing is perfect.
Performance in use ~ test run
On my test run, a short, overnight tour, this liner worked wonderfully! As I noted before, getting in and out was absolutely no problem; just slip it on like you would a pair of pajama bottoms that go up to your shoulders, slide into the sleeping bag and zip it up. I find that lying on the "far" side of the bag makes it less likely the liner will get caught in the zipper.
I bought the liner mainly to keep the bag clean, as it's easier to wash a $20 liner than the $300+ bag! And as the campground was actually closed (see my diary), I had to go to bed with the days sweat still on me. So I was glad I had the liner! When I got home I filled the sink with cold water and a little Woolite, worked it through to wash away any bodily residue, then squeezed it out under running water a few times to rinse. Five minutes total. I didn't try line drying it, but five minutes in the dryer on low heat and it was as good as new.
If it kept me any warmer I don't know, as I haven't tried sleeping in the bag alone. I did notice one thing though: Usually when I'm in a mummy bag I tend to "wear" it, as it will turn with me, even if the hood isn't tightened. But with the liner this doesn't happen. Even though the hood was loose I could turn inside the bag just as easily as if I were in my bed a home. The silk slid around inside the bag with no resistance whatsoever, and the bag remained "upright". IOW, I didn't end up in the middle of the night with the hood lying on top of my head! And at no time did it tend to wind itself up around me, nor did I find the liner to be any more "cramped" than the bag itself. I could move my arms around inside it as easily as if it wern't there at all. However, I am only 5' 10" and 165 pounds, so that may have played a role.
Anyway, as it has performed so admirably under actual use, I am upgrading my original rating to 5 stars.