Major regression on the part of developers of this: default tool had an option to look past 30 days in recent changes and the like (so you could, for example, set a number that is lower that 365 and see last X revisions for that number of days), the new AJAXy one just reverts user-defined number to 30 days.
I understand that it is not that needed on recent changes page, but since you are gradually expanding these new filters on other pages (such as Special:RelatedChanges, Special:Watchlist etc.), it is not right to remove this feature entirely.