The glare isn't bad. I mean, it happens, but you can rotate the screen, so its no big deal to just tilt it in a different direction. I've never had it where I couldn't read the screen.
As far as losing it, I just tether mine, so even is something were to happen, it wouldn't fall to the ground. I just use one of those neck straps lanyard things with a clip, so just clip it in. Its easy, and no worries.
Also, I wired in a uly power outlet, so I can plug it in on longer trips and not have to worry about battery life or anything. Really convenient, and has saved me a few times by finding gas stations for me.