Nobody can really say unless you can buy the exact same model, made on the exact same assembly line that their's came from 5 years ago.
This is a constant headache. Some models from some companies last forever. Another model from the same company is terrible. Model changes are routine as are country of assembly changes, assembly line changes quality control changes, etc.
Then there is the problem of companies "trading on their good name." A company gets a reputation for making good products for a few years, so they cash in by making a really bad one at low cost to them, but charge high to maximize the margin. People pay more for the rep. Only a year or two later do people find out that they have been had.
This goes on in all lines of products, not just monitors. Ask someone about Hoover vacuum cleaners. If they haven't bought one in a while, they will say very good because they used to be very good. If they bought a Hoover in the last ten years, they will say junk because the plastic wheels fall off in 6 months.
It's just that in the PC biz, time is compressed. Where Hoover took 40 years to build up their good name and tore it down in ten, Seagate (for example) took 5/1 and about the same for Western Digital.
So it's a crap shoot. And anyone that tells you otherwise is not well informed.
Looking at Princeton models five years from manufacture now, I would say slightly less than everage. But that means absolutely nothing.