What a great product!
I live in Houston Texas and ride long distances as well. While the seat of the BMW R1200RS does not get hot from a mechanical heat source (like an exhaust), heat does build up and every bit of airflow can only make the ride more comfortable. While I have not tested this in a Houston summer, testing it today (65 deg.F) suggests that it will perform very well – it must by design. You are kep elevated above the surface of the seat and as a result air is able to flow feely. It also seems like a durable product that will last for some time to come.
Review on YouTube: https://www.youtube.com/watch?v=P-4CCaXJbi8