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Yeah, they're called Xtreme, presumably for a reason. Would make sense to buy the one with better bearings as the hubs are non user serviceable so longer time before service = better.
But I would need the adapter axle (but that would also make it more versatile should I buy QR15 fork).
hippy-
Worth checking with ISON or your LBS but I think it comes with the adapter
http://www.ison-distribution.com/english/product.php?part=HUSPPX25KI'm about to replace my dyno wheels, considering going to go for the X this time round but want to check it in the forks, with rotors and caliper first as I did have a little trouble with the last one.
atk
SP PL-8 is centrelock + 9mm qr
SP PL-8X is centerlock + 15mm axle, they offer an adapter to use this with a 9mm qr.
The bearings in the X series are a little bigger and the flanges a little taller and further apart. I think the chart also suggests they're slightly more efficient, but they are £50 more and would need the adapter for your fork.