I have purchased a couple of things online. I have ordered from Barnes & Nobles, Gap, and Victoria's Secret. I never had any problems with it. Although, the clothes i got from Gap were a bit too big. I am going to go to the store to get a smaller size, if they dont have it then i will just exchange it with the online company.
Although I am the kind of person that would much rather go to the store and pick it out and have it that day- sometimes its easier to order it from your computer, especially when you are super busy and dont have time to go. Its also a nice bonus when the things at the online stores are A LOT cheaper.