Overall I love the Soft-Lite windows. I had all of my windows replaced, 22 in all. I was worried about the price but after they were all in I believe they are worth it. The windows open easily, are easy to clean and my wife loves the ability to open both top and bottom sash at the same time. I have noticed a big savings in my utility bill. In the winter I do not feel that nasty draft as I did with the old windows. People can be standing outside of my house holding a conversation and it is not heard inside when the windows are closed. The only issue I have had is the pop out security locks to keep people from opening the window from the outside. Many of them have popped out and won’t stay in when I try. I have had several replaced but the continue to pop out. I don’t know where to turn to get them fixed. The installer comes each time I call but they continue to fail. I am not sure how to contact the manufacturer.