At first I had trouble finding the switch on my ML50's and 300's in the dark since the cover does not poke out like the classic maglite but I got used to it. I like the 50 better than the 300 but still have 300's for the long runtimes if needed.
I like the ML300 too, but I am gravitating more towards the C cell Mags lately. I do find the switches on the D cell Mags easier to find with my thumb than on the C cells for some reason. A habit I got unto long ago is to keep my thumb on the switch whenever the light is in my hand, so that I am ready to turn the light on/off instantly (the electronic switches are great for momentary operation).