We upgraded our enclosed patio with Craft-Bilt 4-track stacking windows, completing the project ourselves just outside the GTA. From visiting the showroom and picking up the windows to installing them, the process was smooth. The Craft-Bilt team was professional and knowledgeable. The well-designed and attractive windows have significantly enhanced our sunroom's functionality and appearance. Installation took around an hour per window. I wish we had found these windows sooner.