I think the quality of a Wilton beats HF every day but there's no denying that you couldn't truly use enough HF vises to the point that they wear out or break in your lifetime to equal the price that some folks are asking for their well-used Wiltons.
I've sold quite a few Wiltons to companies tired of breaking imported, junk vises. Several times they've said the downtime lost costs more than the price of a good vise, so it was an easy expense to justify.
I've also sold a lot of Wiltons to people who have just broken an imported vises and they decided they didn't want to waste any more money on something that was just as likely to break again.
What everyone seems to be missing is that of all the brands named in this thread, who's still left selling essentially the same models after all these years?
I love lots of other brands of vises, but there's no way for someone to get a good idea of value other than looking at eBay sales prices. With Wilton you can see what the current prices are, and then compare that to a nice used/refurbished vise and decide what you're comfortable with paying.
I can usually buy, fix/restore/etc and sell a Wilton for right around 1/2 of retail price. To the guy setting up a welding shop, spending $600 on a restored 600S looks pretty attractive compared to $1,200 for a new vise that isn't really any better. To the guy building a new service truck, $300 for a clean 1760 looks a lot better than $600 for a new 1765. Those are just two examples from the last week.
Sure, those guys could have spent hours trying to learn about vintage vises, searched for one, maybe found one that was good, maybe found one that had issues, etc. It's a heck of a lot easier to buy something that's a known quantity, and something you can get parts for in the future if you need them, which isn't true of most other brands.