Sorry to come in so late on such an important topic, but I've got to add my three cents worth. Almost every comment in this thread has the correct opinion. Some people don't use screen protectors and others get the best.
I don't think that anyone can argue that ZAGG isn't the best, but do you really need it for the N7? I think it depends on how you use your tablet. If you're like me, my machine is usually in my bag or in my hand while I'm in my easy chair. ZAGG is overkill.
On the other hand, I would never use less than a ZAGG on my pocket computer. It's in my hand when I'm walking. In my shirt pocket most of the day (except sometimes when I bend over). I want a lot of protection on my main mobile device.
Like so many other things, everyone needs to get what is best for them.