It doesn't matter what we think, we're not the ones who will be using it regularly.
I will say that hard body cases are generally a bad idea. They do NOTHING to protect the system that is really worthwhile. Drop the system from any height that would damage it without the case, it will be damaged with the case as well. Hard cases will translate all that kinetic energy through the system instead of absorbing it. So, they're really just a waste of money, and they can cause thermal issues as well.
As for backpacks, anything with a padded laptop compartment should be fine. The more padding the better generally speaking, but the law of diminishing returns exists here as well. Don't rely on the padded compartment to protect the laptop from any amount of abuse. Remember you have an expensive bit of electronics in the bag, and treat it accordingly. Do that, and you'll be fine.
I was wondering what you guys think the best case is for my Macbook Pro? I like the carbon elektra by slappa (http://www.slappa.com/HardBody-PRO-Carbon?sc=2&category=56016)but I also like the Targus XL too. (http://www.google.com/products/catalog?hl=en&expIds=17259,17291,17315,23628,23670,26474,26761,26849,26869,27126,27520,27615,27690,27698,27744,27746&sugexp=ldymls&xhr=t&q=laptop+backpack&cp=10&qe=bGFwdG9wIGJhYw&qesig=G7La-7hhj-POH6tr428KZw&pkc=AFgZ2tmaGl_2UZyjeADXIhv7oG14tWXczvGtxMd1PxupbSGMn9alim5GKTIPMLRFgus-FOQBCZ2OJpNCFA5okYrZG0jOYXdx9Q&um=1&ie=UTF-8&cid=3574338663613939079&ei=L_rrTOSOBIWKlwfWjYmJAQ&sa=X&oi=product_catalog_result&ct=result&resnum=3&sqi=2&ved=0CGAQ8wIwAg#) What do you guys think?