I'm not sure that I'd go quite that far myself, but a good under eye concealer does make a difference if you're short on sleep or just naturally prone to dark circles (I am both. Miss London still considers 6am to be a lie-in).
I like the old formula Bobbi Brown Concealer Kit, which came with the creamy concealer and a mini pot of loose powder.
|Old kit left (Ivory) New Kit right (Warm Ivory)|
|New creamy concealer left, Old creamy concealer right|
While Blogger was down I made a video using the new kit, and comparing it to the old kit.
I actually prefer the creamier texture of the old creamy concealer personally, but I do think the reformulated version will be easier for more people to use.
Disclosure: reformulated kit was provided as part of a blogger launch event for this product. I bought the old one myself.