Hey all, thought I'd share a little feedback on the Spider Pro holster vs. the Capture Clip from Peak Designs.
A little background: I shoot mostly events/weddings but also enjoy hiking around and taking nature photos. I hate neck straps and sling bags, don't mind sling straps but still find them cumbersome. My camera is a 60D with battery grip and a few mid-size lenses.
I first purchased the Capture Clip because I thought it would be an inexpensive solution to carry my SLR on my belt. Unfortunately it really isn't designed to support a gripped SLR. I tried mounting it to all manner of pads and nylon straps I had laying around the house, but it still pulled on my belt and left the camera hanging at an awkward angle. Peak designs sells an accessory, the "Pro Pad" that is supposed to mitigate this problem, but it costs $30, which puts the total price around $100, nearly as expensive as the Spider Pro holster. I really like the design of the Capture Clip and think it would work very well for backpacking with a small SLR or G-series point and shoot. It's great that you can mount the clip anywhere and that the plate is compatible with Arca tripod heads. However, it just isn't a viable solution for carrying a heavy camera.
I really didn't want to spend $135 on a camera holster, but after trying the Spider Pro at a local camera shop, this fool and his money were soon parted. The belt is very comfortable and the plate and holster are well-designed. It doesn't feel like the camera is putting pressure on the locking mechanism, as it does with the Capture Clip. Even with the lock disengaged, the camera feels very secure. The plate is, unfortunately, not tripod-compatible. It is also a bit cumbersome and makes setting the camera down on a flat surface somewhat difficult. For large DSLR's, though, the Spider Pro feels much more secure and comfortable than the Capture Clip. It's not ideal for backpacking, but seems to be the obvious winner for wedding/event photography.