I agree, the lighted cover is very easy to tell.
I got a clip only because I read laying back in bed and was worried it may tip forwards. I was using the elastic to secure it on the top corner and it was great, but was also concerned about it slipping off the bed or my lap, this way I feel safer.
But seriously, the lighted cover is just plain awesome, I just wished they made these for Sony readers too, it is near perfect for a reading light. Haven't touched my mighty bright since I got it.
