I use one and so does another club member. Because I like having a "redundant back-up to critical systems" I drilled three holes in the sliding upright and have a tethered locking pin to insert in them to back up the friction clamp. We both made contoured foam pads for the top plate which fit nicely into the contours of the wing underside. This holds the wing nice and steady during rigging. I actually like it better than the genuine Cobra wingstand the club 505 has.

I've also used the same stand with the club Twin Astir. If it can hold one of those solid concrete wings steadily a 15 meter ship is a breeze!