For that price, I'd say a 75ES is just fine. Not a workhorse like a more expensive sony like the R500, but workable, especially if you can confirm low hours. Do note I've never owned a 75es, but have had other sony decks, and know people that have had various sony es decks.
The one big downside in days of old was that it had SCMS (I'm pretty sure it had scms), which is not an issue at all for a deck you plan to use for transfers. It was only a problem when making DAT clones. The other issue I would check is the operation of the door. The sony es decks that I'm familiar with had problems with the door function before problems with the heads. I'd open and close it several time, both with a tape in it and empty, and make sure it opened and closed smoothly, with no strange sounds. Since it is not a flat tray like the tascam, panasonic and other decks I think it is more susceptible to problems.
Also, I can't remember what digital outs the 75 has. I think it has both optical and coax, but as I recall some of the sony consumer decks had just optical, some coax, and some both, so make sure whatever it has is compatible with whatever you are using for transfers.
--Dave