If by this point you have begun appreciating Chaplins work then this is a defenitive must see.
I initially wanted to recommend this a few weeks back but had to mention 'Gold Rush' to the people in denial of Chaplins work and talent. 'Gold Rush' is what made it for me, and is his No.1. 'Modern Times' is just another one of his flawless material he had come up with.
Give it a shot, its surely one of his top 5 films.