Nino. Yes, raid 0 is 2x faster in theory (and practicaly, when it comes to transfering large files, encoding video, etc...). In everyday use, though, it's nowhere near 2x faster performance (talking about applications, games, etc...).
MI, a chance that a single HD fails is still the same, sure. But when one of the drives in raid 0 fails, you lose data on all, right? And the fact that your drives survived voltage swings has nothing to do with raid, I think.