Quote Originally Posted by Larpus View Post
But as crazy awesome as that may seem, they're not grossly overpowered because a single use of any abilities that banishes outsiders can seriously mess them up, bad.
Which is why Summon Eidolon, with it's duration of "longer than the combat will last" is a very, very good choice for one of any given Summoner's known spells. (after combat it's "hey guys, I need a ten minute breather here to resummon properly"). Ambush at night? Same thing. Etc.

EDIT: Also, they're half-casters, so they're far from "Druid broken".
Half casters with discounted spells. They actually get some spells earlier than wizards, have normal access to at least what would be eighths, get Gate as a SLA 3+CHA times per day, and are a CHA-focused class with UMD as a class skill (and if Synthesists, they can take a 1pt evolution to get an extra +8 to those checks). Not quite druid power, but pretty darned good. That gate especially... no material component, very high uses per day, 1min/rd duration without needing to go to the "negotiate and pay for a longer service" clause... Yeah. That's one of those "class features stronger than entire classes" abilities, right there. Dungeon crawling? No thanks, I have summons for that.