A very good plastic window is always very expensive. For a long time, everyone understands that good are very high quality and at the same time cheap things in nature simply. If the low cost of the product, then this should always, at least a little alert, because, as is most likely there is a flaw, which is hidden by specialists. Most often, choosing plastic windows, the buyer is only interested in his name. He is completely not interested in what specific components it is made. Sometimes, even very inexpensive plastic profiles for windows can be of higher quality than expensive profiles.