Thanks everyone. Test ride yesterday (made an excuse to get out for lunch) was nice. It was around town, so only got up to 50 mph. Can tell a difference for sure. Will report back next week, as I plan a long riding weekend. Temps will be in the mid-80s so will be able to see how the heat is. I bought some vents, but will install only if needed (and I might in the hot summer weather).
Grillfish,
Any updates after having the lowers now for a few weeks? I'm still experiencing a lot of buffeting after several shields and I think that most of the rough air is coming from below. Just debating whether the investment is worthwhile and whether I should be looking at the 2010 RG bracket and vented lowers.