Well I normally bang on about the advantages of buying new, but if that Boxford is in reasonable condition and the chap shows it working, and will deliver, I'd jump at it. Make sure the gearbox is OK though.
In the good old days amateurs rarely bought Boxford because their cheapest machine was about 30% more expensive than Myford's best. Well made and robust.
The risk is they were bought by schools. You wouldn't want the lathe from my metalwork class because the poor thing was severely abused by unsupervised yobs.
However, other establishments were much more careful with their equipment. A friend did a stint as a school technician after being made redundant aged 55 and found his private workshop included a Denford. To his certain knowledge it was never used in the 7 years he was there. Absolute bargain if that school ever decide they need the space!
Condition is everything though.
Dave