They do like them but other feautures are much more important than the windows. More important than windows are:Exterior painting, interior painting, granite counters or updated kitchen and bathrooms. Hardwood floor that are freshly refinished are important. Changing the baseboard can give the home an updated touch too.
Ps Ive typically paid $400 per window for dual pane vinyl.
Dual Pane windows are great if you are near the Airport or other noisy area. In a quiet residential street, they are not essential to enjoyment of the home.
Buyers do like "new' and energy efficient windows, so perhaps that would be the way to go.
Yes, it's hard to calculate if you will get exactly $3500 back out of the sales price of your home. However, if your windows are old or in need of repair new windows will help the appearance of your home and how well it shows to perspective buyers.