I was looking through the Eldar Codex and wanted to see the stats for a Seer council on jetbikes. I've never faced one, but i've heard a lot about them.

Is a seer council just an upgraded retinue of warlocks?

It just that it doesn't seems as obviously threatening as various other deadly units i've heard mentioned, e.g. Nobz Bikers

I mean even with warseer psychic powers, warlocks wouldn't be brilliant in either close combat or shooting. Is there some subtle tactical advantage i'm missing?