OK price. Not a great deal, but a fair one as long as it comes with a mower deck.
The 400 series is as good as they get for mowing. It'll serve you well. The are also good snow machines when equipped with blade or blower (with chains).
3PH and rear PTO (if it's got them) are cat0, and attachments can be somewhat specialized. But, from what I've read, the tiller works real good.
The hydraulics affords various other options that can't be had on tractors that don't have it. I use a hydraulic dump trailer behind mine. Works great!