I would definitely buy on older vise, but that's me. You can get a lot more bang for your buck. FYI - I would trade any of the vises below for/towards vintage Stihl saws.
I have a Wilton like the 4 1/2" one below except mine has the pipe clamp. I bought it about 15 years ago for $25.00 from a cousin. I have used it a lot, used to have a machine shop. There have been no problems, but I was in the local hardware store last week and the cost for a new one was $350 Tom
Here are a few Wilton bullets that I picked up on Craigslist the last time I was back in the states. The larger one is 4.5" jaws. The smaller is 3.5".
This is what they looked like when I got them. Think I paid around $200 for both.
Here's a Morgan 6" that I picked up in Italy. Made in Chicago. It's a beast at 143 lbs. This is what it looked like when I picked it up - someone did a rattle can resto. Disassembled, blasted, new jaws, repainted factory light blue.
This is what I have mounted on my workbench - a 6" Record. Nice vise, but not a monster of a 6".