Yep, the front part of seat itself is getting noticeably warm. It's much worse with the low seat. I would compare it to having a seat heater on in a car. It just adds to accumulated discomfort as the ride goes on. The stock seat got warm after a couple hours but it takes longer for the heat to work its way through to the point that I notice it.
I wear jeans when I ride. I can feel the heat coming out the side vents but it doesn't bother me. Riding pants of some kind is next on the list of riding gear I need to purchase.
My peak CLT was 217 on my last log. It took about 15 minutes for it to reach 200