Downside is in MEM, the local pilot shop only had charts, PTS and MAYBE the Airplane Flying Handbook. That, and it was all locked in a case that it took 10 minutes to find someone to unlock so you could actually buy stuff. That kinda turned me off right there. In Orlando, I had no problem since Air Orlando's got the largest pilot shop I've ever seen. I even ordered some stuff from them over the phone (my headset and another flight bag) while I was in Memphis. If you have a good local pilot shop, I agree, support them. That being said, if you can save $50 on a headset, money is money. If it's a matter of like $10-15, then buy local.