I've played level 1 of the Spire a few times so I knew what to expect going in. The main issue I encountered is the low hit die of the vigilante. A d8 just seems low when I'm trying to be an upfront fighter type. This is mainly a problem at level 1 obviously, but I think the Avenger should get more like a d10 to match with the Ranger/Fighter/Unchained Monk.
I also feel like the Social side won't get used much in PFS. At least at my lodge we seem to avoid social situations unless someone is built for Diplomacy (20+ modifier).
All that being said I'm excited to play again at level two when I can actually get a vigilante talent.