I have been using QuickFrames for the past 9 years and they are by far the most convenient roof frame/ floor frame you can buy and install. We recommend them all the time to general contractors and structural engineers as alternates to your traditional weld in roof frame structure. The ease of installation is great especially when you are working in tight areas such as existing hospitals where there is a lot of HVAC, piping and conduits in the way. The customer service at QuickFrames is great. They always reply promptly and produce our orders quickly.