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Originally Posted by Wing
What you gain with a third axis you lose in traction and power. Since the omnidirectional motion of meccanums is produced by vector summation, you'll always have some sort of power loss in whatever direction you go in. Combine that with the low coefficient of friction, your robot may be able to go sideways, but you won't be going fast, and your drivetrain will not have much power, which is never an ideal combination. A 6 wheel skid drive is proven to be far superior in every category, especially since the traction makes up for the lack of sideways movement.
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Just posted a whitepaper addressing my disagreement with much of this. The link is in my signature.
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But, let's not turn this into a meccanum bashing thread again, shall we? 
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+1 irony
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The main important reason for your choice was because you thought it would be cool and would be a neat learning experience, and that's all that really should matter when it comes down to it. I also like the paint job on this drivetrain, it definitely looks neat!
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This part I can fully agree with you on!
