A-Jay gave his excellent in-depth review which prompted me to go ahead, bite the bullet and try Gliss for myself. While my review probably won't be as thorough, and I'm probably not fishing the same way A-Jay would be, I'll offer my insights to it as well.
A few points first....
1. You'll notice the spool is very small, like a small sample of Trilene. But it's because the line is so thin. Besides, I think the smaller spool may help alleviate the line springing off the spool.
2. The line feels like nice waxy dental floss. At first when spooling I thought I'd have white wax all over my fingers, but it didn't budge. I don't think it's so much a coating as just how the line inherently feels
3. When you cast/retrieve, there's almost no sound. This is a nice alternative coming from every reel in my arsenal being either straight braid or braid + leader. This stuff is silent.
As for on the water....
1. The casting distance is unbelievable. Even weightless soft plastics launch with ease. I didn't try cranks or jigs since this was a grass heavy lake and I was using a spinning/finesse setup.
2. The sensitivity is on par with the best of braids. I use exlusively Sufix 832 and PP Maxcuatro. This is every bit as sensitive.
3. There truly is little/no stretch. Being not a braid I was skeptical of this claim but as the evening wore on, more and more characteristics of this line felt like braid, even though it wasn't truly braid.
4. Line manageability was right up there with braid. I fished in about 10-12mph wind all night, and no twist knots or tangles of any kind. It performed here much better than I had hoped.
I bought the 24lb Gliss, in a 150yd spool in Translucent. It looks white on the reel. Matched my Stradic nicely. I pulled in several very nice 3+lb fish through grass and never had a break off, knot slip (see below), or fray. I know on other forums they list fraying as a negative, and to be honest I'm not fishing this over mussel beds or rocks, mostly in grass lakes. So I noticed no fray.
One thing, and this is CRITICAL. I almost always use a San Diego Jam knot or Palomar knot. On this line you MUST use a Palomar, or more recommended a Double Palomar. The line is slick feeling, and I lost 2 lures (cheap ones thank goodness) due to my SDJ simply slipping out. I used a Double Palomar the rest of the evening....not a hint of slip. USE A PALOMAR.
I'm sure A-Jay can add some stuff to all this.
Overall, I'm very very impressed. It does everything it claims to do, and it's not very expensive (15). Buy some, give it a try, and let us know.