I'm one of the G1007/RF-30 owners that
@mikey was talking about. Another (local) forum member and good friend,
Rick Sparber, owns the Enco equivalent and has converted it to CNC.
I bought my mill (in Portland, OR) in 2013 for $700. It was an earlier model, with a tin belt cover. And it no DRO, the original single speed motor, and an inoperative table power feed. So I'd say you're getting a very nice deal, indeed! Will you be getting some collets with it? And a hold-down kit?
You'll probably find that the larger of the vises is way too big for the mill, so you might even get some of your investment back by selling it.
I've added some goodies to mine over the years (VFD/3 phase motor, cheap 3 axis DRO, repaired the table power feed, etc.) and posted about several of them on the forum. You can find them by using search feature (upper right corner of the page). Rick Sparber has posted a number of articles about his mill on his website,
https://rick.sparber.org
As for the round column - yup, as Mikey mentioned, it's sometimes a pain when you have to change the head height and re-find your zero in the middle of a job. What makes it especially bad is having to turn that large crank on the left side of the head. The cranking action "loves" to swivel the head on the column. Plus, it's on the opposite side of the head from the tightening bolts. Other than that, the mill is easy to use, and nicely robust and sturdy. As I said, I bought it in 2013. Been using it since then, and though I do have the room for a larger mill, I'm satisfied with what I have.
Once you get your hands on it, do feel free to ask questions!