I bought mine in July last year and purchased a case with it. I removed the case within three days and haven't used it since. The main reason is it wouldn't slide into my jeans pocket easily with the case on. Without the case, I can put the phone half-way in, let go and it slides the rest of the way in by itself. With the case I had to force it in my jeans pocket. Granted, the case was made of rubber so the friction of it was what made it difficult.
The face is perfect, even though I've dropped it a few times. There are some scratches on the back, but those don't bother me.
I plan to upgrade when the new one comes out, but I'm concerned it will not be as rugged as the first gen, since the back is plastic.