I follow the consensus. Perf in the summer is the way to go. I happened to go in the opposite direction (non-perf leather and a perf textile), but it was mostly an issue of timing: I needed a more versatile first jacket, so I bought leather first.
The perforated textile is good for this time of year with the liner, and w/o the liner for temps above 75. If you're one of us who likes to milk the season for all it's worth, then spend some cash on heated gloves and a decent windbreaker to wear inside your non-perforated jacket. Also a backlava: your neck will thank you
I started riding once the street cleaning began (mid march) when the morning temps were in the 30's, and let me tell you: you need all the wind protection you can get!
Best Regards,