A couple of years ago my wife decided to get me a new main for 18 for my birthday. She went through Murray's, and ended up getting the sails they sell from Super Sailmakers (she wasn't aware of the class requirement). She ordered the heavier cloth version, which is similar to the weight of the Hobie sail. With the heavier cloth, the sail cost about the same as the Hobie sail. It did not come with telltales, numbers, or windows as standard. The claim is that the Super Sailmakers sails are the same cut and dimensions as the stock sails.

See the attached photo - the old stock sail is on the bottom, the new non-stock sail on top. Luff, head and foot are lined up. Quite a bit less area. I wouldn't have been able to use my battens without cutting them down. The sail build quality was excellent - but it was not the same cut and dimension.

We returned this sail and got a new Hobie one. Much better! Came with numbers, telltales, windows, and the area was actually a little more on the leech.