I should clarify--I never got into a true HIIT program (did two sessions) because I read Leigh's stuff about HIIT contributing to/worsening amenorrhea. Since I've had problems with amenorrhea before, without adding HIIT into the mix, I figured it probably isn't the best idea for me.
Not to say I won't consider trying it in the future when I'm sure my hormone levels are where they should be and have been stable for a while--BUT now I would know what to watch for in case I'd need to back off, and I don't think I'll ever try it while I'm in a deficit.