I ordered some of these pucks from Platt a few months ago and was able to install them in under 30 seconds each! They have been installed for 2 months and have not had a single issue with them, in fact I may buying more for my neighbors house. The best part about these is they come 25 units per kit which only requires me to bring up one box on the roof at a time. I also bought a tube of sealant but since it is not required I was able to install the pucks without sealant!