u/Chick-o-Sticks

Thinking of making the jump from the 100-400 mk1 to the 150-600, I see a few decent deals on refurbished lenses.

Anyone have any issues with refurbished lenses from the Olympus store?

Also feel free to give me reasons not to step up to the 150-600 or reasons why I should, I am generally happy with my 100-400.