keongorendar
:
A pro is that your endurance will improve and you will likely take longer to burn out. You will also see more definition in your mussels. A con is that your muscles may shrink in size.
kalashkid
:
its worked fine for me. Change of pace in weight and rep schemes can be very helpful to push pass plateaus. Also helps if you're getting aches and pains with heavier weight
Cons: More fatiguing. More time consuming. Can be difficult to determine actual failure if you are training to near failure.