So one of the upcoming mini-bosses in my campaign is a wihsaak sahkil - these guys get vomit swarm as an at-will spell-like ability (CL 8th).
To me this seems very OP - he can have up to 8 swarms going all the time, or 7 if he stops to make a full attack every now and then.
Am I missing some rule that limits summons, or some weakness of swarms? Otherwise I'm thinking of making it the SLA 3/day.