This would go over like a lead balloon at my company, and, were that person on my team, I’d tell them to change it. It does have a connotation of “when I feel like it” about it, and most of my team is not high enough up the food chain to take that sort of stance (and the ones who are high enough up are client-facing and have the good sense not to do so).
Who hasn’t longed to write something similarly huffy? Well, LA-based designer Paul Woods, for one. Woods is also the author of How to Do Great Work Without Being An Asshole and suggests opening your OOO with this: “Dear sender, As you are already aware, I am on vacation. However, as it appears that you have flagrantly ignored the numerous emails, in-person conversations and messages over the past week communicating this, below you can find a detailed recap what I will not be doing until my return…” It’s a recap that extends to wearing clothes, even in public, and moderating his consumption of hard liquor.

Some of the people I know that have a lot on their plate are able to deal with a large volume of email with intent and integrity. It’s worth taking a look at how they deal with email so you can model some of their habits. I’ve listed three people below who I know handle their email really well.
However, I’ll be checking in whenever I can, and will respond to all emails marked ‘urgent’ as soon as I am able to. For immediate assistance, you can contact me on [mobile number].