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While time stopped you can't use spells which will directly affect others but you could use it to get a 1 round casting time spell off without being interrupted (e.g. summon monster), to cast fly and move out of reach, to cast a buff and a quickened buff, etc.
Is it worth a feat? Maybe. It's mainly a defensive ability, if you're using it then something's probably gone wrong. If you're good at avoiding or preparing for those, probably not.