Absolutely needed upgrade from felt. I went for the 3.7mm to make sure I get full benefit.
Focus is much better. Tonal range is obviously saved from a lot of platter noise. You can really start to criticize recording quality of an album once you get one of these. The noise floor really is much, much, lower. I use to think a lot of the noise was just the sound of vinyl but it was the crappy felt letting way too much through.
Vocals sound a little quieter, which is almost strange except I think simply that instruments are retaining much better resonation to them.
I had been skeptical if it would just be a cute upgrade since the platter itself is still metal, the turntable nothing special, etc. It really works though

. Definitely catching more subtle information.