As long as they look and sound good, I don't see any reason not to buy demo speakers. My Monitor 90Ps were floor models, I just checked them out very carefully to make sure there wasn't any damage. I had already spent a lot of time listening to them, they were the same speakers I had demoed. The shop was an authorized Paradigm dealer, so I got the full factory warrenty and a 30 day return store warrenty, along with a very good discount.
Of all the secondary market options - refurbs, open boxes, b-stock, and demo models, demo models are the most preferrable. A demo is just a brand new model that has been broken in, and one which you can audition and physically examine before buying. Arguably better than buying new.
Refurbs have been used and possibly even repaired. Open boxes have been brought to someone's residence and never refurbished - you don't know how the item was treated. B-stock is just that, something new but with a (usually) small defect. I will always get a demo model when available. I got my Denon 3801 a few months back as a demo model for $475. Beat that.
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