I do like this sling. It is nice looking and well thought out.
However, I know many reviewers have said how light it is, but I think it could be even lighter. It is the same weight as the small Cirrus backpack, which surprised me. The sling holds a lot, which is wonderful, but pay attention what you put inside, because when fully loaded, it can be heavy. This is not a problem when used as a waist pack, but after a while you notice when over one shoulder. I think the metal buckle on the strap adds a some weight and digs into your shoulder. I would like to try and change the buckle if I can.
Since the bag curves around your body, sometimes the zippers are hard to unzip one handed, which I often find I have to do. I would like a non-zip pocket to place a phone in easily and quickly. Maybe one that fastens with magnets.
Having said all that, I really like it and plan to keep it.