We have tested a few different blades from many manufacturers here at NYPD ESU. One of the ones we like best is the Rescue Blade from Alpha Tools Company (
www.alpha-tools.com). Contact a company rep and ask for them to send some for t & e. They have been good to work with. They make a terrific glass cutting blade (vetro? I think) we have used several times on a smaller hand-held grinder/cut-off saw. We pretty much use only Stihl saws and they have held up really well for us. Hilti also makes good blades as well as a lot of other stuff we use. Our quickie saws see extensive use in the breaching of fortified locations and also a lot of rescue work. Hope this helps.
Karl D.