I'm about to add a spin rig on my Hughes 35 (I=44ft, J=14.5ft). A
little googling yields a variety of opinions on the reasonable upper
size limit for an end-for-end gybe. I think the boat is too big to
manage it with single, loaded sheets, but that it should be manageable
with separate sheets and guys. I'm looking for other opinions and/or
suggestions on what works best for you.

As for thrills, a gybe in 20 or 30 knots of breeze can be pretty
exciting no matter how it's choreographed ;-)

Ryk