Newb query about heroic squad setup

[Lilal]

Hi,

I've been lurking here awhile and have tried multiboxing to some success (limited only by an old computer which i'm upgrading as we speak)

I'm looking to get a 5man squad that will complete most/all heroics, and noticed that the majority of squads I see on here are 5 shamans, is this only because they can heal/dps in same spec? I guess this makes them easier to control than tank/healer/3dps etc.

As a question to any of the 5 shamy owners have you found any limitations on what instances you can/can't complete, do some bosses one shot you still?

As a side question, has anyone ever healed a 25man raid with 5 shamans? Wondered how the organisation works with that, or if it's too random heals to control 5 at once.



Thanks Lily