You didn’t say how much the dealer was asking. In their day, these were top of the line machines. If they have been maintained, they should still sew well. My dealer still uses them in the classroom, particularly in her children’s classes. I’m not sure, but I think they were some of the early computerized models. I would ask if the machine was a trade in by a customer known to the dealer, and if the dealer had performed regular maintenance. I would take a properly maintained used Janome over an inexpensive out of the box machine from a big box store. Finally, ask if you can sew on it. Take in a number of different types of fabric and sew!! Whether it is a “good deal” is dependent on the price and the how well the machine was maintained, and whether you like sewing on it!!! Also ask if the dealer is willing to put a 30 day warranty on it.
Yes Janome used to go by “New Home” in the United States. They also make models for many other manufacturers.