The most skoolies kept the original school bus windows. But we decided to switch to the RV windows… and, after installation we are not sure it was good decision. First, the RV windows we bought on Amazon and eBay are very low quality. It seems that they are done with the cheapest available materials, and feel more like one time use toy than the window that could withstand rain and movement of the bus. Second, the installation of the windows was disaster… there were not any fitting bolts and nuts with the windows, and we had to improvise on the spot. Well, all six windows are in, and will see how long they will last.