Second hand office furniture is a good option because there are excellent products in the market if you know how to search. This is not like buying an electronic device which can be sometimes risky if you dont know the level of usage it has. This explains why is not so complex to find those stores that sell and buy used office furniture while it wont be so easy to find a similar store for electronics. By taking some basic precautions, there should not be big troubles. These considerations have to do with the type of material of the ítems you are buying, the brand or company that is behind that unit, and the number of years it has been in use.
In fact, this point is not always extremely relevant. It may be the case, that the material is very noble and resilent, which means that it can be a great product for many years. If you like for example capri furniture, it could be perfectly possible that you find an excellent discount capri chair. Going to brands, I think one of the best options is Herman Miller. There might be others as good as this brand probable, but one thing is sure: if you buy a Herman Miller chair for example you will not regret. At least that is what I experienced.