Need opinions on a purchase!!

Hello, first off thanks for taking the time to look. Second, I don't know anything about anything yet so any advice would be helpful and greatly appreciated. Finally, I have found a Trek XO1 on Craigslist for $300, in my eyes it's a great deal for my first CX but would like everyone's opinions! However, it's a 57cm and I am 5'10.5" with a 32" inseam 130lbs. I've got long legs so from what I've researched this size frame shouldn't be too big for me as I can make minor adjustments. I just don't want to buy this bike and end up causing myself pain or buy a bike that's obviously too big.