that warning above is pretty much complete bull****. There are three main deep section rim wheelsets that you will find on ebay. Look into Vuelta XRP wheels, Velocity Deep V, and Wienmann Deep V. People are going to tell you that there is a huge difference in them all but honestly they will all have about the same weight and all have about the same shape and you most likely wouldnt notice any difference other then cosmetic between them. They wont need to be rebuilt as previously stated but they may need to be tensioned or trued when you get them. A shop should be able to go over the wheels for you when you get them and check everything over for a small fee. The main important part as with all wheels is to use a quality cog and lockring and have them properly installed.