Ask then what the DOT date is on them, I suppose you are going for "new" tires, also ask them if they were mounted.
Unmounted and stored indoors are obviously best.
EDIT, also check the prices of there wheels against this option, You would need to mount them though, which I prefer because I try to buy tires based as above and a it is much easier to determine that they have not been mounted and they were not stored outdoors.
I have bought these and were happy but for the fact the nuts provided were not hard enough, easy enough to get good grade 8 flanged nuts.
AND the shipping is not bad when combined with bead locks.. and the bead locks are cheaper when paired with the wheels for some dang reason, at least the last time I looked.