I've not used it myself, but I've seen a couple reviews on it when it first came out and MB was giving free samples away.
Apparently the new design actually creates more problems than it fixes. The performance is anything but consistent.
Since I've read that MB non-shark sleeves work fine, the problem is almost certain one of design rather than construction or material.
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"The Bird of Hermes is My Name, Eating My Wings to Make Me Tame."
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