Well I finally got a chance to test the Raceka suit out and it's definitely worth the money!!!!!
First off it works as advertised and keeps you cooler in the hot and warmer in the cold.
The ride: got a little sweaty getting set up and out the door. It was ~90f and had to recal the susp from commute to canyon and had forgotten to do it before dressing. This suit will make it hotter when standing still, I don't see how any layer of clothing wouldn't so not a bash, just reality.
So, finally got moving and it was like I was in air conditioning!! I could feel the raceka wick the moisture to the surface and anywhere on the suit where I had good airflow I could feel very significant cooling. The bad news, once dry the cooling action went away but of course at least I was dry and this was much more comfortable being dry and the suit not sticking to me.
Up into the mountains to ~7000 feet and ~60f in the shade and the suit kept me warmer than I'd be in anything else so thin and coffortable.
Down into the desert and it was ~100 in the sun, as long as I was moving it wasn't too bad as the raceka kept the suit from sticking to me and improved ventilation. It was hot but nothing is gonna keep you cool in that temp. It did help make me comfortable though.
Back home, the suit came off like nothing where I normally would have to fight to get it off.
So overall, fixed my biggest complaint about my leathers and the knees of the leathers didn't stick and get out of position after standing and then getting back on the bike in a crouch. Helped getting the leathers off a ton. Kept me dryer and cooler better than expected.