I need to buy some heavy duty tough cordless toolkits for my construction class.(Drills ,impact drivers saws, grinders) I had hitachi for a few years but my students drop them from roofs and benches and work them hard so most have either broken casings or worn out motors Bosch seem to have the toughest outer casing ? as I was very impressed with some of the clips on you tube tests. Also their cut out system seems good, however it seems not all their tools are the robust model along with brushless ? their website is very confusing with all their models. Also run time and features not as good as Milwaukee ? ( my other choice at this stage ) My choices so far 1. Bosch ( tough outer casing) 2. Milwaukee (outer casing ?) 3. Hilti (cant find much info out there on this brand) 4. the rest Mak, Dewalt, Hitachi, ect all much of a muchness IMO unless some one can prove how tough the casing is. Thanks