Ridley's Cohort said:
Quicken isn't tactically important until Quickened Haste becomes available. That at level 12 at the earliest for sorcerors, a convenient moment to grab Quicken if he really wants it.
Personally, I find other feats tend to work out better. But, Quicken can even be fairly good as a 9th level pick if that's the direction you want the Sorcerer to go.
For example, a 14h level Sorcerer might cast:
Quicken Haste (off scroll)
Shield
Mage Armor
if he wants to significantly boost his AC on round one.
But, a 10th level Sorcerer can get the exact same result with:
Quicken Shield (off scroll)
Haste
Mage Armor
Granted, the Quicken Haste gives more flexibility, especially with regard to casting Quicken Haste, normal spell, metamagic spell. But the Quicken Spell feat can be very nice once a Sorcerer gets to 10th level.
Course, either way, it is expensive to cast it off a scroll (but cheaper for the Quicken Shield in this example) and the rules do not allow for Quicken Haste in any item other than a scroll (although personally, I blow this off).
So, yes, Quicken is a expensive feat for a Sorcerer, but it is doable.