I guess the most obvious bit, with the gift of hindsight, is how bad neck straps are. They are annoying.
I picked the RS 4 because I didn`t want a bulky strap and wife is right handed and I am left handed.
Didn` research about other similar products, I justed wanted something that wasn`t a neck strap.
Canon Powershot S95, Canon 6D,7D, Canon 40 2.8 STM, Tamron 24-70 2.8 VC, Canon 17-40 L, Canon 15-85, Canon 85 1.8, Sigma 30 1.4, 50mm 1.8, Canon 100 2.8L Macro, Canon 70-300L +Kenko 1.4 Pro 300DGX, Canon 430EX II and RS 4 Classic