Wow I had one last night!
I had an online race and the host set it to rain. It was at Monza and like most I was trying the 488 GT3. My FFB seems to be fine for surface detail if not tyre slip. Started dry but a thunderstorm hit. It looked great and all the puddles started forming around the curbs. There was a big puddle under the old circuit overpass bridge. I went through it at about 150mph and felt the wheel tug as the wheels parted the water and I lost a few mph. Like a braking effect which wasn't evenly balanced. Awesome! It felt so convincing. Just like driving through a real puddle too fast in a road car. Made me lol. Couldn't wait for the next lap.
I was taking seconds a lap out of the people ahead because I was then avoiding the puddles on the curbs an they were struggling through them.
If only the rest of the game worked properly.