I've been using the previous generation of the Patagonia Stealth Atom sling for a couple of years and have been happy with it's flexibility. Lots of room to hang crap from the strap as you can see! I keep a small fly box in my left shirt pocket and between that and the fly patch, I don't end up having to swing the main compartment around very often. I like the fact that the water bottle pouch on the Patagonia slings are on the outside of the main compartment. I can get my water bottle without swinging the main compartment around. The Smith Creek rod holder is convenient for fly changes in the river and releasing fish.
I hang my net from the d-ring using a magnetic holder at the top of the loop, not from the end of the handle. That way the net nestles on top of the sling and doesn't swing around at all. I don't find re-attaching the net any more awkward than with the vest I previously used.
Ken
p.s. I am left-handed. A right-handed person may want less junk hanging on their right side.