The AISIN made one on my 1MZ-FE (I don't know if it is the same for your 5SFE) looked brand new when I replaced it with the timing belt at 160,000 miles. Of course, "looked brand new" is subjective, but there were no obvious leaks and the bearing "tightness" seemed quite similar to the new one I installed.
OTOH it wasn't all that much money for a new one, and since I was already changing the timing belt it wasn't that much more work to replace the pump. I also swapped out the camshaft oil seals since they were underneath the inner timing cover.