ruleslawyer said:The other major issue, which of course isn't part of the core rules, is what happens when the Improved Metamagic feat comes into play at epic levels. Assuming that you can stack Empower, it becomes a FAR better feat to have than is Maximize. For that matter, the lack of stackability of Maximize is a disadvantage compared to Empower even at non-epic levels.
On the other hand, if you take Improved Metamagic twice, you can get Maximize down to just a one level increase too. Then you could Maximize a spell and then Empower it several times, which would net you more damage, on average, than one extra Empower would.