Geoff,
nope, not tried one, but have long championed the modified 50mm finder system, and it has been discussed in other threads.
The idea is great, and if I had to be critical of the picture they provided, to my mind the weak link would be the tilt attachment. With a guider this wide, it could be welded to the mount/scope/whatever and you would still find a guide-star.
Gary
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