Bests & Worsts Reviews from Amazon

I had to return this to the manufacturer for a refund. Why? There is a button called "start presentation" that alternately generates an ESC and F5.the ESC takes you out of presentation mode, the F5 restarts the presentation from the beginning. This button is very near the "back" button and I accidentally push it approximately once an hour. This completely messes up my presentation - and there is no way to disable the button. Thus I cannot use this during a professional presentation - it is just about guaranteed to create an unprofessional event for me, and I do presentations for a living. So as much as I love every other part of this device, I had returned it to Logitec and ask my money back.