I have only placed a couple of orders with Marco, but I have always gotten great service from them. I couldn't believe they took the time, effort and expense to print color labels for some of the parts I got... very cool. I'm sure all the barcodes and stuff are a big part of how they are able to keep track of the crazy huge number of parts they carry in inventory. They also gave me a free Marco luggage tag with my last order - a nice touch. The only complaint I have is that a lot of the parts I need are out of stock, but that's not really their fault and at least they are listed on the site with part numbers for reference. They are definitely a huge asset to the hobby. If you're reading this, thanks, Marco!