I just ANOTHER one for my S5!  So....   six now.  After a Diztronic, two Otterbox Commuters in different color combinations, a Spigen Tough Armor and a Tech21.  The latest pickup is my favorite - Spigen Slim Armor.  I really have nothing bad to say about most of the others except the Diz, which is only good if you want something inexpensive.  
Otterboxes are fine, of course, but looking a little dated. The Tough Armor is a beast - both good and bad.  The Slim Armor is what I've been looking for and didn't even know it. 
Now, about a different color for it...... !