Submitting paper to IEEE journal using the standard `article`/`proc` LaTeX class Do IEEE Journals accept LaTeX-formatted manuscripts using the standard article or proc class provided by LaTeX?

It is not made clear to me, if I should stick with the IEEETrans class IEEE has provided me with or I can just use the standard article classes - pre-installed with LaTeX - and submit my manuscript this way. 

Thanks in advance
I disagree with Bill Barth's answer: I strongly believe that you should use the LaTeX classes that IEEE has provided you with.  The reasons are two-fold:


The reviewers will be used to almost always seeing IEEE submissions in IEEE standard formats.  If you submit in another format, it will likely prejudice the reviewers against you, as it will appear "amateurish."  Whether or not this is fair, it is a risk you are taking with your paper that there is no need to take.
Many IEEE journals have length constraints, and some are quite adamant about them.  If you submit in a non-standard format, it will be difficult to tell whether you are actually complying with the length constraints or not.  This may annoy the editor, again unnecessarily.


IEEE formats are pretty easy to use, and have really good instructions.  Since that is the case, I simply see no up-side to avoiding the standard formatting, and plenty of down-side.