A data point: Easy Built Models sells 'their' tissue and Esaki. Their comments about their own brand tissue indicate that it's not the same stuff as I got from Peck. If I can't find joy with Peck tomorrow I think I'll order from Easy Built instead, and try their tissue.
Update:
Esaki tissue is still Esaki tissue. I just finished covering a Comet Gull wing (I know -- not CL), and it works as well as I remembered.
I also made up a little 12-inch span test wing to cover with the Easy Built 'cheap' tissue. It's
way better than the other stuff I have -- it doesn't shrink up nearly as nicely as the Esaki, but it does shrink up where the stuff from my LHS barely shrank at all, and repeated applications of 70% isopropyl alcohol gets a bit more shrinkage each time.
The Esaki tissue is probably three times more expensive, and their white isn't really fully white, but I'll probably use it anyway -- I build for fun, and it's a joy to work with. But I'm not sneezing at the stuff from Easy Built -- it's nice tissue, it's just not
great tissue like Esaki.