Yeah, but in my experience (~28 years worth) the heavyweights don't stick to your skin as much so you tend to get better airflow. I find heavyweights more comfortable in pretty much any climate. It's basically a matter of personal taste, I suppose.
My understanding is that Tokaido has licensed their name to other manufacturers recently and that some of the gis made by those third- parties are not up to the old Tokaido standards. If that's true, it's a damned shame.
I really like the Shureido heavyweights. Alas, the ones I bought in the factory store in Okinawa in 1990 (for ~$85/each) have long since gone to the Great Dojo in the Sky