To expand upon Ponyruiz comment, until 55(Jaridah) for most jobs, this is a full time piece (exceptions of mnk/nin/sam - Fuma's). Even after 55, this piece still offers a high amount of HP for both it's level and the slot it offers, which is useful for soul eater and staying alive (if you're into that sort of thing), as well as 2 str, which should prove useful as a WS macro piece until as far as 65+, when better options (such as Rutter Sabatons at 67) begin to crop up.
The short is that boots tend to not offer much stat wise until 75, proving these to be extremely valuable.
