The correct answer s/b "it depends"
Depends on what??? *boxObviously the sail plan for one's boat is the first thing. If your power is in the headsail the downwind rules are different than when your power is in the main. I have Vision 32 with a 129% jib and 5/8 fractional rig. While my headsail is very small, my main is quite big and I've added a large roach. Naturally DDW is less a problem for me than for somebody with a main that is half the size, but also with a 155% jib that is not fractional and therefore perhaps twice the mainsail area.For me, when the wind is above 12 knots then the penalty for sailing DDW is just about null. I can go wing-on-wing, bag my main so it works to its potential and more than make up for the extra distance were I were sailing 150 say, instead of 180. However, it the winds are relatively light and/or variable then it's probably spinnaker time for me and I'll sail 130-150.Whether your boat is designed and rigged for asysmetrical rather than symetrical spinnaker is also an important consideration when deciding upon point of sail. As you probably know, it is impossible to sail an AYSO DDW. I do have two AYSO's cut to go deep so 150 degrees is A-OK. I can do even do 160-170 but it's hard and not worth the trouble unless the seas are flat and the wind is consistent. With a symetrical spinnaker one can go DDW and still go fast. Of course symetricals don't perform well above 100 whilst AYSO's can do 60-70, depending on cut, so it pretty much all balances out.Speaking of seas, whether DDW is a good idea depends also on local sailing conditions. I sail in the Pacific Ocean and we have waves, tides and current and all are important of course. But we also have swells coming all the way from Japan, and they are most always a significant consideration in deciding how we get from A to B. Frankly, the direction, size and speed of the swell are ususally about as important as where the wind is coming from when sailing downwind - If I can surf a 10 foot swell I will and whether or not I'm going DDW is far less important.Rodger