1. I've only used the bcs so I can't compare
2. Yes it does pwm
3. 4500w works fine with 5gal, 5500w works too
I like the bcs-460, especially if you have any plans that could use the functionality of the bcs. PID's are nice if you want to dedicate them to just the one task...
Kegged: Amarillo Ale, Edwort's Apfelwein, Golden Dragon, 1554, 888 RIS