To Strafe or not to Strafe

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I've been reading up a lot about mecanum and omni-wheels here and other forums online. Most of what I'm seeing is "X wheels are great and easy" or "rule 1- never use X-wheels again", both with sometimes one line for why.

Watching youtube videos of both, I'm seeing that they certainly get the job done, but requires a lot of skill from the driver.

I guess what I'm asking is if people could give a little more detail as to why or why not they are using mecanum or omni-wheels.

To help me search (and possible consolidate the list later with answers and credit) please list your response as:

Mech +
good reason

Mech -
bad reason

Omni +
Omin -
Mech/Omni +
Mech/Omni -