I picked up a M&P 45 trade in a few years ago. Night sights dead so I used some bright white model paint to make them white dot sights for day time lol. some holster wear, but otherwise in decent shape. I'd have to check my records, but I think it was a pretty decent price vs. new.
So a few months back when AIM had the full size M&P 9 trade ins I figured I do the same. So I picked one up. Functionally it appears to be fine, was pretty dirty inside, but that was easy to fix. Exterior is a little rough, but night sights are dead for sure. Price was ok, but when I see some of the low ball prices for a new one people are posting I regret not shopping around more.
My goal all along with both trade in purchases was to buy a second/"backup" for each of my main (purchased new) pistols and I think I met that goal with both. I'd like to clean up both, get the sights updated and maybe look to refinish them. One question I've never tried to answer is are there product improvements that I should contact S&W regarding?