That is a very good deal! A ready to go 5X7 enlarger is a rare thing indeed.
I am not in the market, but I would love to see images the base of it someday, for my enlarger research. I am learning, I am not an expert.
It resembles this past APUG listing. (there was a url link here which no longer exists)
I have seen one operate, and it is cool the way it motors up and down, has a fan suction/blowing up inside the main tube and does white or black enlargement vignetting.
5X7 is so much easier than 8X10, in many ways. Smaller, duh, cameras, lower film cost, cheaper enlargers and much smaller size. if you have room for a 4x5 enlarger you have room for this.
Do not hesitate.
Phil, are you paying attention?