Can't really speak about the mega X, but several years ago the sports authority in Dallas, Tx was carrying some balls I looked at.
They had an ebonite 8-ball, but the core was totally different from the high performance model, this one only had a pancake in it.
Also, they were carrying a ball labeled Nitro. Sadly, it too was only a cheap, pancake cored knock-off of the original.
Not saying the mega x is a pancake core, but they have a reputation for selling cheaper versions of the originals. Might not be high performance at all, so I would be leery of it myself.
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