NewEnglandSkier13;c-38406 wroteI currently have a pair of boots that I bought new and a pair that I bought used. All of my skis were used to some extent. I have a mix of new poles and ones left in the lost and found at the end of the season.
The most important thing for me is that I only buy skis with demo bindings. That way I don't have to worry about my boots fitting.
With respect to demo bindings, if one is a grown adult, who's feet aren't rapidly growing, and one isn't say a regular park skier where there's actually some reason from time to time for moving the center position of one's bindings forward or back a centimeter or two, the reality is that most non demo bindings have plenty of adjustment "length" in the heel piece so account for the slight variance that the boot sole length of a new boot may have. Plus, demo bindings are noticeably heavier and have more of an effect on the flex of most skis than non demo bindings, and lastly, if those demo bindings are mounted on a "popular" pair of skis, then they become more enticing to a low life who is looking to take a pair of skis off a random rack and likely quickly put them up for sale on ebay/Craig's list.
If you just plan on using them yourself, while there can be some pluses to finding a pair with demo bindings on them (heck, my wife and I each own a pair with demo bindings on them), there are also some drawbacks, since there is enough adjustability in most bindings made within the time frame that you'd still want to use a binding these days to account for boot sole length variances without having to re-drill the binding mounts....