I have a 3.0 and ride for approx 10 hours a week.
Good – Pack is light, sits low which helps in several ways, leaves a large area of back free to sweat…. nice, never rides up and hits the back of your helmet when riding down steep techy stuff, wrap around design is soooo practical, you can access both zipped side pockets plus both mesh pockets, these are big enough to house food, multi tool, phone etc with no problems. Pack size itself is good, I get a mountain morpth, shock pump, jacket, hat and gloves plus tools etc. I rode the SDW with enough kit for 2 days and nights in it.
Bad – No compartment, this is no problem to me but I know some like it, bladder tube routing and length are not great nor is the bite valve.
Basically I have tried pretty much every make out there and i find the Wingnut the best for me. as mentioned, if Osprey were to put their mind to it I think the perfect pack would be a realality.