In response to Toraen, seeing as my game revolves around hazards/sand I find these less of a pain then others probably do. If you Whirlwind them after a Curse they're usually less than 40-50% and with sufficient hazards up they die upon the next switch in. I also find if you can Trick a Choice item onto them it reduces their impact significantly.
It is a good set though. Have seen it destroy unprepared teams.
I've just tried it out on my own hazard/sand based team and did pretty well with it. I generally would not curse against something that I know can phaze though (especially if I'm sitting in hazards), and I also carry trick to pass on the flame orb and give myself some insurance against opposing trick/mess with balloons (although something as slow as a level 2 mon is not the best way to do that).