Is there really any reason to keep "On My Mac" calendars and contacts?

I was wondering if anyone has deleted their "On My Mac" contacts or calendars in Address Book or iCal since upgrading to iOS5 and Lion.
I haven't had any real issues by having both (aside from seeing duplicate birthdays in iCal), but is it really necessary? I prefer to keep things as streamlined and simple as possible, and would consider deleting my "On My Mac" data if there's no downfall. Is there any chance iCloud could crash, and I would potentially lose everything?
Thoughts/comments appreciated.

I just have iTunes sync with the Address book & calendar on iCloud, but I wouldn't delete it from my Mac or I would lose my contacts if I lose Internet connectivity.

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