well, i just wanted to add my opinion....
well, im a good pilot, i guess i can say that.. i fly a funtana everything stock with a 61fx engine.. and i perosonally find that flying in 15mph wind is the same as flying at 1-3 mph wind; ecept for the landings, torke rools and elevator manuever...

well, 1st let me tell u that i can do almost all 3d maneuver, all the basic 3d as blender, knife edge spin, waterfall, etc is easy in wind or no wind, i can do rolling harrier too, i always do it at about 12ft high, starting higher than that and getting it closer to the ground little by little, i find that rolling harrier is just a little more sentitive when it is really windy, but no big diference when is calm or windy...

elevator, the plane fly backwards when too windy... but the biggest diference i find is when i do torke rool or hovering... when no wind i can tork rool at 1ft off the ground with my eyes close, but more than 5mph wind, things can get really dangerous if u r not carefull...

1st thing to torke rool with wind is to never cut the power too much when u want it to come to a stop (when there is no wind, when pulling the plane vertical, u can cut the power completly until the plane gets to a complete stop and then add power to hover it, in all that transition, u need very little correction to mantain the plane vetical)...but with wind, if u cut the power completly, just before the plane gets to a complete stop, there is no control over the tail and the plane tends to drop out of the hover with no control.. so u add full power, but in that 1.5-2 secs of transition that the engine takes to rpm up, uve already droped about 9ft if u come out with tail wind, and if u start to close to the ground, ucan crash... it happend to me...

in this pic, i just pulled it to a hover. it started good, but 1 sec later, a big gust came and pushed me all the way around, and i had to come out of it with tail wind..... it toke me less than 1 sec to add full power, but the plane drop all the way down with a perfect stable harrier or elevator and i landed it from torke rool..... i consider that as a crash althought nothing happened to the plane.. and this is the biggest problem i find in torke roolong with wind.....