Is it an advantage to buy a shell for Macbook?

Not unless you’re traveling or commuting a long way. I’d rather travel light.

Scratches. That is about it. I wouldn’t use one since I don’t care if it gets a few scratches on it.

I have owned an iBook for over four years and have never used a shell. The notebook has a few scratches (and a small crack from when I dropped it), but otherwise it still looks new. Of course, Apple may be using different materials in their newer laptops…

I’ve had a shell on my white MB for the past year or so and I took it off today when I replaced my battery. I think it’s more scratched now than it would be if I had never used the shell! I was planning on taking the shell off for good, but I’m just going to leave it on….my computer looks like it was dragged behind a car!

tl;dr No shells aren’t worth it!

scratches is the only thing. it’s not generally a good idea.

My Macbook already runs hot, I like the look of the hard shells, but I think it must retain the heat inside. Doesn’t seem like a good thing.