I ordered a laptop, received it and then realized I accidentally ordered the wrong one. DirectTech was very understanding and shipped me the correct one right away. Really good customer service.
I'm just getting started in photography and the sales rep actually advised me NOT to buy some of the stuff on my list, saying it was unnecessary. Saved me over a $1000!
DirectTech has some hard-to-find items that really cater to enterprise/industrial builds. Even cables...some of the ones they stock are near impossible to get.