Multiple cameras... a move to the tripod... events shooting...
I shoot weddings and have more than one body so having to unscrew is a major hassel.
I agree the Sunsniper is built better but odd there is no quick release. Plus, it has been reported that unit goes wonky also , due to lint/sand/etc getting caught up in the bearing assembly... so it ain't perfect either. I do like there straps better though.
So, do you use the Black Rapid FastenR-T1 that has been mentioned elsewhere in this thread? That seems to be the only solution for these sling straps + tripod + quick release.
I did a search for carabiners similar to the Black Rapid offering, and unless you are shopping for human rated hardware (climbing or safety) the construction seems to be similar to what BR has, although I could not locate an exact match.
Maybe that is why Sun Sniper does not have a quick release. The proper hardware would be cost prohibitive and/or bulky.
I did not consider problems with sand and the Sun Sniper. I suppose everything has its tradeoffs.
But, I am fairly confident that the Sun Sniper swivel assembly will not come apart even if it is full of grit. It has a pretty good sized external snap ring holding it together. The D ring is also stout and stainless steel.