Underscores just helping us create a structure. It's not for spaces between words
.
It's nice to use My_Super_Cool_Class_Name
if you have structure like:
My
Super
Cool
Class
Name
Surname
Surname45
Glass
Name
Gas
Name
Cool1
Gas
Name
Cool56
Gas
Name
Middle
Cool
Class
Name
Surname
Surname45
Glass
Name
Gas
Name
Puper
Cool
Class
Name
Surname
Surname45
Glass
Name
Gas
Name
But if you gona have only 1 folder in each, defenetly use My_SuperCoolClassName
structure not to make your head blow trying to get to file which is LAST in the chain and not to make your Kohana expand every folder while searching required files on loading.