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Should I fully parenthesize expressions or rely on precedence rules?

Let's say I have a boolean condition a AND b OR c AND d and I'm using a language where AND has a higher order of operation precedence than OR. I could write this line of code:

If (a AND b) OR (c AND d) Then ...

But really, that's equivalent to:

If a AND b OR c AND d Then ...

Are there compelling arguments in favor or against including the extraneous parentheses?
Does practical experience suggest that including them significantly improves readability?
Or is wanting them a sign that a developer really needs to sit down and become conversant in the basics of their language?

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    True, there's a very good chance a AND b probably should be replaced with either a function or pre-calculated boolen value that has a more descriptive name.
    – Jeff B
    Commented Jun 11, 2013 at 14:30