I hit for over an hour today with the CES Neon Dust, freshly strung @ 43/46 as recommended by Grapplesnake. As a background, my normal strings are the Volkl Cyclone 18L/19g mains or 16/17g natural gut (VS/Luxilon/Klip/Babolat) with crosses using Tecnifibre Pro Red Code Wax 18g. Thicker strings mean weight went up 3g, which shifted the balance forward a tad. I haven't tested the swing weight but definitely felt more heft in the hoop.
I was hitting with a D1 college female player with a flatter game, and played a set of doubles with partnered with her 4.0 friend, against her and a 4.5 guy, after about 45 minutes of hitting.
Feel: Board like but not harsh. Obviously coming from thinner gauges of poly, it was expected to feel more board like, but it's not harsh. My VC/PRCW setup has crisper feel. As others have mentioned, the square and hexagonal profile make these strings feel thicker than the indicated 1.23/1.25mm thickness. I felt like I was hitting with a 15Lg string.
Power: Less power than my VC/PRCW setup, again, expected, and hence I dropped tension by 4lbs on the mains to compensate. Definitely not as powerful.
Ground strokes: Being lower powered, I could swing out faster. I also had to arc my shots to hit shorter angles which made me feel I wasn't getting the same bite as my usual setup. Launch angle was quite level and playing with not so heavy hitters, I could evaluate the string better on shots.
Volleys: The lower power and slightly increased swing weight gave some decent punch volleys, albeit without good feel of connectivity. I only hit 1 drop volley off a not so heavy drive. I didn't feel the strings bite clearly, , but the control was good.
Serve: I only served 16 points so it's tough to judge. Wasn't trying very hard but it didn't impress me much.
Spin: I don't feel the Neon Dust hybrid increased bite as much as the lower power allowed me to swing harder than usual at the ball, which is what polys were designed to do.
Overall, my initial feel is that the Neon Dust hybrid is a lower powered string which lets players swing out at the ball harder. With my more powerful setups, I don't have to swing as hard (and I am talking about no more than 5-10% difference). For me, added spin means more bite when you swing to hit a flatter ball. Still, this is something I'd like to wait till I hit the Playsight court to verify. I will be doing that Monday with a heavier hitter, who will stress me more.