During a heavy dosage of alcohol I came up with an idea to help make Vitasuits more relevant.
Now, you can purchase the first Vitasuit which gives a +1 bonus to health. The plus version gives +3 at base, the deluxe a +5. The Vitasuit Deluxe itself also mentions "Spiral Medics" whose job probably was to keep their squad alive and well.
So why not make the Vitasuit a "medic's" gear? The bonus to health from the armor could have a secondary bonus that is only apparent when reviving your team-mates. Say you were reviving a team-mate using the basic Vitasuit while you're at 8 HP. Your HP would split as normal, but this is where the Vitasuit kicks in: you lose ONE less, while your team-mate gains ONE extra to respawn with. These numbers are taken from the armor's health bonus. The result is he'd be revived with 5 HP (instead of 4), and you'd be at 5 HP (instead of 4)
Farther up the line a level 10 Vitasuit Deluxe's +6 could become game breaking, so perhaps the amount you "save" in reviving can only be a maximum of 3, while the bonus to them can be dropped to +5.
An example of reviving with the deluxe could go as follows: You have 10 HP and the Vitasuit deluxe at max level. You revive your team-mate. You give only 2 HP due to having to spend 3 less, but revive him with 10 thanks to a +5 bonus at level 10. Therefore, you end up with 8 HP but he is back and at em at 10 to continue being your meat-shield.
The spread would probably be something like:
Vitasuit: -1 when using your health to revive, +1 to revived knight
Vitasuit Plus: -2 when using your health to revive, +2-3 to revived knight
Vitasuit Deluxe: -3 when using your health to revive, +4-5 to revived knight
This could turn into something terribly exploitable (revive a teammate then let the medic die to be revived with extra HP?) but the idea itself seems solid...if it IS too gamebreaking, just have them be incremental numbers (the plus gives +2, the deluxe +3 only). It also works to explain why the knight carries a medic pod on his back that doesn't appear to be attached to the armor: obviously, it's a medkit!
Just some thoughts. It could give players a new role in combat, as well as make the Vitasuit a kickass item. In closing: Hooray OOO for making the most addictive game me and the missus have ever played. Take all our money.
I like the idea of making Vitasuits revive teammates with extra health, although I'd leave the exact balancing to OOO.