Without magic sticks, I'd guess the real wind range to be about 5 mph and not a bunch more! Especially any first run tubes out there! There were some issues with the layup of the materials! With the reinforcement the magic sticks provide, I'm sure it's higher, but as REVflyer said - they aren't a guarantee against breakage!!
Weaker than black race? I wouldn't say that! Different flex and weight, and works well in the suggested wind range! Just another piece of kit that needs be flown in the proper winds! Push it too far ----- SNAP!
As with everything Rev, you have to be comfortable with your equipment matching up to conditions!!