My wife and I both use sliding-type Sunsniper straps, which work like the Black Rapid straps. She prefers the version with the metal cable that reinforces the strap against cutting. I prefer to be able to cut the strap in event of an emergency entanglement situation. I am not sure whether the Sunsniper or the Black Rapid was marketed first, but we found the Sunsniper at a local camera shop first. (Both are simple copies of cavalry carbine slings.) I prefer the lower-profile one-piece Black Rapid mounting point, and purchased one of them as a separate component. If I misplace my Sunsniper, I would be as likely to buy a Black Rapid as a replacement, though the next paragraph will discuss another possibility.
I have temporarily attached a Magpul MS2 sling to a camera, using a Black Rapid attachment point. This is a rifle sling, made for firearms, which is a high-quality product. It is quick-adjustable for length, can be used as a single-point sling, has a quick-release feature, and has been superseded by an improved MS3. I plan to investigate this option further, now that availability of Magpul slings has recently improved. (My one Magpul sling is used for its intended defensive weapon role; I wear a badge and possess weapons for official purposes.)
The Think Tank neck strap works really well on my Nikon FM3A. I have purchased a second one, to try on a heavier Canon DSLR, but have yet to mount it on any of them. There are times a simple neck strap seems more appropriate, and the Think Tank product seems very intelligently-designed.
Canon 5Ds R/7D2/7D/5D/40D/1D2N; Nikon F6/D3s/D700/FM3A/Coolpix A. Lens selection undergoing changes; some favorites: Zeiss 2/135 APO Sonnar, Canon 100mm f/2.8L Macro IS and 135L, Nikkor 14-24/2.8G and 200/2 VR.