Doesn't work so well with a tabbed browser, where each tab is going to have a different optimized 'maximize' size. It's decent for folder windows and etc. though.
Hmm, that's a good point I hadn't actually considered. BUT, I don't see it as a big problem because once you resize for the largest tab, it's not like the others become unusable, they just now have some redundant space. It helps that most sites conform to a standard range of widths.