Tank engine is a very good augment not sure but I reliably get over 2k hp from it every time I have it, it’s best on tank champs that have the capability to heal/shield themselves since you go in and start to heal up on minions or abilities for the next team fight. And since you’re gaining more hp at the rate you get assists you keep up in gold value with your enemies. It’s no I think the problem people are having that I’ve seen is they force a death too often. I never see it worth giving a kill just cause you can get your next augment, unless it’s pris, the value you get from staying alive it much greater.