I'm deciding between the Osprey Fairpoint and Osprey Porter. I had tried on a friend's Farpoint 40 M/L and it fit me so great. Even with heavy load i was comfortable. So i decided to try a Farpoint 55, thinking the frame would be the same, but it's not - in the M/L it's WAY too big on me. I hope the S/M fits or I will be bummed!
You can fit a ton of stuff in the large compartment (and if you don't use packing cubes you'll love the compression straps. I wish there was a bit more organization on the small day pack. it's pretty much just one pocket. Maybe another stash pocket on the outside?