My understanding and experience with BLINQ is that your mileage may vary, reports have been mixed, and my personal experience wasn't great. I ordered a pair of Sennheiser HD 579 open box from an ebay BIN auction from them and while I did get an HD 579 box, inside it was a pair of HD 280 headphones. While their support people were pleasant and very quick to respond, there was no option to actually exchange them for a pair of HD 579 (even though the ebay page was still up), my options were keep the HD 280 with a partial refund on my purchase or return them via postage prepaid label for a complete refund. I went with the latter option. I'm very surprised that in their packing process they don't at least have someone check to see if the right headphones are in a box when they ship them out, doesn't speak very well to how they operate, since that isn't a big ask.