[Coda]

By the way, having Tension Heal on your team is totally optional. ;) Given the choice between Tension Heal and a score bonus for non-boss songs or damage for boss songs, I'll take the latter. :P For songs with a combo requirement, Tension Heal is basically meaningless, since breaking combo in the middle of the song is going to make you fail whether it kills you instantly or not. (When a song only has 300 notes in it and you have to make a 160 combo to pass, a single Bad or Miss between 140 and 159 combo will fail you, no matter how well you play for the rest of the song.)

Tension Heal is still somewhat useful in boss fights because the purple notes still deal damage on a Good even though you break combo, but it's only useful in a fairly narrow range -- you have to have enough Tension to survive taking a hit at all, but if you have enough max Tension to survive the the first wave you're better off killing the boss faster with damage skills so that you don't take those hits in the first place.

I'd like Tension Heal a lot better if Tension actually mattered, but when I fail songs it's either due to missing the combo requirement or due to a single hit dealing more than my max Tension.