Not a huge discount as these are usually around $400, but $50 is $50.
i imagine the lume should be fairly decent, and I’ve no problems with the size.
I’d knock it for not using a fully seethrough case-back, and that there are no micro adjustments or half links on the bracelet, so it’ll either fit or not.
Sapphire crystal, Swiss movement, and a not entirely unknown brand for $350 - I rate this a good deal. Very Seiko SARB 33/35 like.