I have had no "pilling" effect whatsoever. I have taken mine to the beach several times, camping a few times (as a ground cover), used a picnic blanket, and it has also been used by my wife as a cover for her cargo area in her SUV when she is hauling our dogs. All of this and it still hasn't shown any wear.
It has been washed 6-8 times has gotten really soft.
Tyvek vs. Neat Sheet?
The Neat Sheet is much softer than even washed Tyvek. Very comfortable against the skin. Reminds me of Frogg Toggs type material, only softer. Camparable to t-shirt cotton after it has been washed.
Neat Sheet is water resistant to a point. A light spray of moisture just beads up and can be shaken off. Water will pool on the sheet but it will get wet if pressure is added. For instance, if you sit on the Neat Sheet with a wet swim suit it will get wet. If submerged in water it will get wet. It dries really fast. Tyvek has it beat on water resistance.
Nothing sticks to my Neat Sheet including dirt, sand, sticks and leaves. Give it a shake and it's gone. BIG advantage over Tyvek. Anyone who has used a piece of Tyvek for a while knows it gets "hairy" and will pick up debris that is really hard to get it off.
Neat Sheet weighs 9.9 oz for a 57"x77" piece of fabric (regular size) after the weights are removed.
Neat Sheet is much more breathable than Tyvek. The material itself is 2 layers sewn together, but it's really easy to blow through it. Although breathable, I think it would do a lot as a wind stopper layer under a hammock, probably adding a few degrees of warmth. The website even states it can be used as a wind blocker.
I ordered a combo set of Neat Sheets from Ebay. My plan is to use to 2 regular sized Neat Sheets (I already have one regular size) to make a bottom weather shield from one and a summer top quilt/ \top weather shield from the other one. It been really hot this summer and I have found myself sleeping in boxers with no top quilt. Usaually I get cool in the early morning and I will use a top quilt that just covers my legs. I think a Neat Sheet top quilt would be perfect for summer time temps and also pull double duty as a top weather shield, just like the JRB top weather shield.
I am also pretty sure that I would be able to use the bottom weather shield as a very light under quilt, say temps ranging from 65-70*, maybe a little lower (I'm a very warm sleeper.) I am also going to use it as a mat for underneath my hammock when it's not being used as a weather shield. I like to have something to set my shoes and an other stuff on that keeps it from direct contact with the ground. I normally use my sit/torso pad but the Neat Sheet would be perfect for a "welcome mat" under my hammock.
If it is viable to use the Neat Sheet in the ways I described it will also be a nice weight savings and reduce bulk in my summertime setup not to mention it would be a dirt cheap way of making a summer under quilt/top quilt/weather shield/wind stopper/mat. Gotta love multi-use items
All in all, the more I use this Neat Sheet the more I like it and the more applications I can find for it. I would highly recommend picking one up and trying it out. The only complaint I have is the color. The website shows it available in different colors: Blue/light blue, red/blue, and green/purple. The only color I have seen in stores in the blue/light blue. The darker of the 2 blues would look alright facing out, but I would like to see the green color.