i have never used the stock sail (DAVE PARKER SHREDDED IT BEFORE I BOUGHT THE BOAT! WAY TO GO DAVE!!!) but know many who have. they did love the stock sail (esp downwind with its super roachy plan).

I use cut down tornado sails (as do all 6 of the local 5.5 and 6.0 mystere's here in Dunedin fl). i hear the tornado sail is much faster than the stock ones.

i have 2 tornado sails with different plans and they sail very differently. After a year (100 sails) on the USA 808 sail (used Charlie Ogletree / Johnny Lovell sail) it tore a few times and i had to get a new one.

i had a hard time getting used to the new sail. The second sail (USA 80) has much more draft and is great in heavy air (even though i would have thought it would be better in light air) and the one with less draft is a better all around general sail (responds pretty well in both high and low air).