I looked online for a Black Rapid selector tool, but couldn't find any. I looked on YouTube and couldn't find many reviews comparing the different models.
I have a "normal" strap today (UpStrap) which I love, but have noticed that when chasing my kids, it's a bit difficult around my neck or shoulder because it slips or falls forward. I'd like to give one of these sling straps a try, but can't decide which one.
Can anyone provide a summary of the models? I seem to be leaning towards the curved strap only because I see so many regretful comments about the RS-4.
The specs say it comes with a bean bag and the protect strap. Do you ever use your protect strap? 
