Long time 1.25, 17g Lynx Tour in grey user. I recently strung up my three Prestige Pro 2021 with the 1.20, 18g in Champagne, at 52 lbs main and 48 lbs crosses. The tension and stringer were my usual setup. The string looks like a 17g thickness, even though it is what Head is calling as a 18g. After hitting for about 4 hours, I have the following comments. I definitely prefer the grey stiffness, it's subtle difference, but maybe I just need more time to get used to the new string. There is more spin, not a huge gain, but it was noticeable when I served a kick or slice, or hit a heavy ball trying to push back an opponent. Power difference was negligible. Not a bad looking string, but not necessarily something I would have chosen had the 18g been available in a different colour. in short, the 18g has all of the beneficial properties of the 17g with a little more spin.