Well, I have the Lightning jacket and Chicane pants, but I JUST bought them and I live in Indiana, so I can't give you a good answer on ventilation during summer. However, I will say that I have to wear long johns under the leathers in 50-55 degree temps or I freeze from wind chill. And that is with the zippered vents closed. The Lightning jackets have breathable fabric in areas where your body won't touch pavement, as well as the zippered vents.
Well, I used to wear an AGVSport two-piece, but the jacket was too small when I would wear a back protector. Since that suit was white/red/black and I bought a new blue R6, I just decided to go ahead and buy new leathers. Like I said in my first post, I ended up with Lightning jacket and Chicane pants. No pics to post though.