I'm running a PbP of the PFS scenario "The Sarkorian Prophecy," with 6 level 10 characters:
Kuwabara Kasei, Warpriest
Chara Ring, Swashbuckler
Lorkov Petulankor, Bloodrager
Barlo Balfori, Investigator
Arae Garven, Hunter
Alcibie Ligeia, Skald
The gameplay thread is here, if you want to follow along.
So we didn't finish the scenario, and in fact only got through the first two encounters.
My impressions as the GM:
The Warpriest didn't seem much different than a Cleric or Cleric/Fighter multiclass. There just wasn't anything major to differentiate them. But this was with the original version, so some of the changes might help that.
The Investigator proved useful with extracts and skills, but took more of a support role than an Alchemist would have.
The Bloodrager was probably the coolest; he had the power of a Barbarian, with the tricks of an arcane caster. Definitely a winner.