Everyone seems to be of the opinion that if it was a 1 PS increase it would be useless. That's in line with other 1 cost EPTs and 1 cost upgrades as a whole. Adrenaline Rush turns a red maneuver white for /one turn/. Lightning Reflexes allows you to do some crazy thing like a one hard Segnor's for a /single turn/. Wired allows you to reroll focuses on attack if you're already stressed. Intel Agent allows you to look at one dial after dials have already been set so it's usually irrelevant.
The one cost upgrades should only effect your list by providing about 1 point of value. VI has way too much of an effect for a 1 point upgrade.
It probably would be useless- VI is good for passing certain breakpoints and it doesn't pass very many with a 1 PS increase. Keep in mind that it's competing with strong EPTs like predator, PtL, and Lone Wolf for the aces it's on. I don't think Scum Kath is all that great at PS7 and she still wouldn't be great at PS8. She needs to outbid practically everyone to keep them off her side for how expensive she is to fit out.