I still have a California Water Blade from a LONG time ago. I was also a huge skeptic. It's made with thick silicone that still shows no wear. When they first came out everyone said it will scratch your clear coat/paint. I bought one and washed and dried my car as normal with a terry cloth towel. I checked an area for scratches with a magnifying glass. Then I washed that area and used the water blade. I couldn't find any scratches. This thing was relatively expensive then. I don't know what the newer ones use. It does help a lot. I can dry the car with one good waffle towel.
As for waffle towels, the best one I ever found was my wife's old hair towel. She bought a different design and gave me her old one. I have other car waffle towels but none are as thick. I recently bought a set of Meguiars and they're nowhere near the quality. So look at women's hair towels but be prepared to open your wallet - good ones are not cheap.