I love my MP-8, don't know about the other two though. I feel that the MP-8 is the nicer of the three which is why I went with it. I can definently notice the difference with it in though. Mileage went up as well.
My purchase and opinion of it in comparison is not from actual experience, just advice and research. The puck seems much less refined, without the smooth power gains that the MP-8 brings. No real experience from the EZ, but I havn't heard anything bad about them either.
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