My local outfitter emailed me this week to say he had the Hornet in stock, so of course I had to go over and try it on. First, it's a very nice little pack, well designed and executed. The back panel foam and the small rods provide some support -- though nothing on the order of a ULA Ohm, for example.
However, the M/L size is woefully too short for my torso length. I have an M/L Osprey Kestrel 32, and with the adjustable shoulder harness I can get a very good fit, but the Hornet was just so small it was funny.