I've used Scholl Concepts S3 Gold XXL, S17+, S20 Black, S30+ and they work really well. Their Spider Cutting pads work well too, its a very underrated German product on this forum.
I used an orange ccs scholl concepts polishing pad and LC orange Hydrotech polishing pad. The defects in the paint warranted a polishing pad rather than a softer finishing pad in my opinion. All up I used 6-8 pads with a pad brush for cleaning on the fly running the 3401.
4 heavy passes and 2 light passes.
The product worked a treat removing around 80% of defects. Wiping down was a breeze. The product removed easily.
Of course it rained the day after the client received the car but I was informed the surface was beading nicely.