Same with that bio converter on such as a sniper rifle, not good, as in higher levels it sucks much more than 5 percent health, where as if you just increase ammo and clip size with such as a Black Widow that is much better and you will never run out of ammo ……so many so called wonderful mods are not all that wonderful in real game play.
Properly building a character will allow health regeneration when you cast a tech skill (found in team skills) and health regeneration saves the day many times. Having played the game several times and about to delete all saves and start a new game I find that ALL, ALL fusion mods are detrimental in some way and it is best to avoid them all.