How does redemption work, numberswise? I've never had it work. As for Enhanced SIght or Scent of Fear, are they as lame as I think they are? Scent of fear has a pretty weak range and skulks can already parasite. Enchanced sight can be fixed by turning up your monitor's gamma (don't act like you dont).

Are there any other redeeming values to these?

Redemption works good.. it scans your health in some interval (1-2 seconds I believe) and if you have around < 30% of health it transports you to hive..
Good only for bests with many HP (onos, fade).
Main drawback is just like drawback of movement chamber .. transports you sometimes into building and stucks you there