I'm considering replacing the windows in the rear of my house. This is
for noise improvements- I've had no trouble with energy costs.

Question: The window frames are in good condition and are, I'm pretty
sure, Standard builder aluminum with 1/8" glass. One window salesperson
said I should get vinyl windows with double-glazed argon/etc (which, of
course, he was selling). Another suggested I would be find just
replacing the glass with 1/4" thick double glazed safety glass.

Has anyone tried the glass replacement and been happy/not happy with
it? What have you thought of it?

Thanks,

Roger