After years, it's still going!
I've got a 2010 non-top loader 35L model (not made anymore), so this may not be very applicable to whats being produced now. The one thing I definitely can comment on is durability!
After 2 months of backpacking in SE Asia, and 2 years of working on farms, this pack is still perfect. I mean, it's showing its age , but the stitching and everything is in top condition I'm about to jump over to SEA again, and love the fact that I can bring a pack that has passed all the tests many times over with me . Love it!