Is there any difference? They appear to be the same weight from various sources, so with the LX are you just paying for finish? It wouldn't be the first time that Shimano had trouble coming up with a real differentiation between products (e.g. XT vs. LX cranks from a few years ago that were only different in finish and an aluminum vs. steel small 'ring).
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: LX vs. Deore center lock hubs