I've run a Telocat from the spin pole tip for years. Never had a snag with the spinny (mid-pole snuffer).
Find it very handy in the light and imediately after a tack/gybe to get the right heading. Don't use it much once under way on a leg....not like the old days when the "apparent wind abeam" method rules supreme. Tried the much older mast head vane a few years ago...only useful in the light...rake is an issue. Also took a lot of scourn from the top Tboat guys in the country when they saw it up there...must have psyc'd them out ;-)