Scrolling through Amazon for 7 segment displays and wondering why some are so much cheaper than others. What am I sacrificing by cheaping out?

My guess is that I'll be sacrificing some brightness and/or longevity if anything at all. Given my current need is just for prototyping, this should be a reasonable tradeoff to save some money. If this project goes to a production version I sell, I can look at higher quality components. And I'd be buying on a larger scale which should keep my unit costs reasonable even then.