I've expressed my appreciation for them before, but both my GRs are on DSPTCH Standard Camera Sling strap, (worn bandolier style) and they're absolutely perfect for me.
For bigger SLRs I use a Custom SLR Air strap, again worn Bandolier style, it takes all of the weight out of the camera effortlessly, and the ability to lengthen/shorten it instantly with the slide system is way more useful than you'd initially expect.
Both of them contain quick release style connectors, but I run a velcro cable tie through the connectors, making it completely secure.
If you want to remove the strap or change it (for those that share connectors) it's easily done by undoing the velcro, but it's absolutely not going to be undone by mischievous fingers without you knowing, and it makes the connector even stronger.