i have had many different cases on mine. and yes it it "hard??" to slide out.
But what that means from me is that it doesnt glide. It kinda keeps it more secure from sliding out say in your pocket or what not. It doesnt ruin the integrity of the phone at all either
So really go with what ever you want. I personally like the fishbone one.
search Lg Enlighten, Lg Optimus Q, And Lg optimus Slider, they all use the same cases and batteries