The reinforcement cost is currently "fair" 26*4*2 = 208.
And yes, using then aggressively makes you manpowerless. I think it is the deal, giving you a cheap spammable murderous squad which utility decrease quickly after they done their 1st job.
It gives you an insane advantage early but slows you down a lot.
I dont like to reinforce them. I prefer to spawn another squad.
I loves them because it encourages creativity and changes the way the game, is played.
Kozo.
In that case:
Falchrimjaeger - 38x4x2=304
Jaegers - 37x4x2=296
It was talked many times that spawning from builing comes with a cost, that's why Partisants' reinforce cst is not fair.