Quite a few people had these on my Antarctic trip. Some thought they were OK, but for example one of my friends was very unhappy with his. He had the 3N1-30.
... the zipper system of the opening, and the design/construction/materials meant that it was VERY difficult to get in and out of with any kind of hand-wear [...] the big clasp closure would close the top flap by a corner, but the flimsy material meant that lenses could still tumble out of the bag when it turned on it's side - which my 70-200 f/2.8 IS discovered on landing number 1 [...] unless you zipped the top enclosure all the way to one side or the other (ie, if you secured the zippers in the middle), the top enclosure would work itself open [...] 300 f/2.8 almost came out twice [...] Very disapointing AND scary!
The
3N1-10 is the same basic design, just smaller. If you don't put important things in the top compartment you might be happy with it, but be aware of the risks.
I considered getting a 3N1 to take to Antarctica, but in the end I stuck with my LowePro SlingShot 300AW and was very happy with it. It's not a bag I would want to wear for a day's hiking (the 3N1 has the ability to use a 2nd strap so it's not always a sling) but it (the SlingShot) is my general-purpose "run-around" bag.