Works like a dream, thanks. We sailed a medium distance race (by your standards) on Saturday,about 37km long. Some very tight reaches with kite up in about 12-20 knots, crew out on the wire. Spinnaker was easy to sheet in & release, no snags gybing. After the race we realised that one of my ratchet blocks was even switched off, so we were using a free-running block ! I don`t think my crew would have held a 1:1 sheet even with ratchet on in those conditions, she would have been pulled through the blocks !
Sunday we raced 4 races in conditions varying from 12 knots to about 18 knots in the last race, again forgot to switch over the ratchet, in spite of that my crew could handle the spinnaker quite happily.
We`ll never go back !

Cheers
Steve