Hesston 4755?

I've got the chance to buy a 4755 Heston 3'x3' x8 square baler. Hoping to have a look at it some time this week. He says its field ready, used this year and has about 45000 bales on it. He wants $17000 for it and going off of others I've seen and market book I think it's an alright deal. Just wondering if anyone on here has any input on what to look for in a used big square baler(this will be my first), what I need for hp to run it. There seems to be a lot of awesome feedback on this forum so any help is welcome.

Also if I was to do custom baling or baled a bunch of straw this fall to sell with it what would you charge?

Hesston 4755?