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I used the Stroboframe cold shoes at first, but they do not use the Canon pin locking system. They depend on tightening down the side screw on the cold shoe, which clamps the foot in to the shoe, and it may come loose if you are not checking it. Just a little loose on the side screw may have your flash slide out. Tightening down the side screw too tight also can possibly damage the foot on your flash. Once I discovered the Crane cold shoes, I never use the Stroboframes any longer, but the Cranes are indeed expensive. It is great to have a choice, so thanks for the mention of the Stroboframes.
The Canon pin locking system still stays engaged to prevent a slide out even if the ring on the Canon foot is a little loose. You will notice and feel the flash wobble around a bit and be able to firm it back down before any chance of the flash sliding out occurs. Not a perfect system, but as long as you have it on your flash, you may as well take advantage of it. As a side note, be sure to loosen the ring on your Canon flash foot all the way before sliding the flash out, or you may damage the locking pin.