The cush wheel is a lot heavier, and it might not be necessary on the 530 as it has a damper built into the clutch unlike the previous generation bikes. On the RFS bikes I run a cush hub on both my motard and dual sport wheel sets. Besides the 525s often cracking the solid hubs in high traction conditions, it also helps with wear on the countershaft splines, which can be problematic.
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12 690 Enduro-R, 12 Husaberg FE570, 09 KTM XC-F/ 450 RFS hybrid, 07 KTM 450 SMR, 09 BMW F650GS twin/F800GS hybrid, 03+05 YZF-R6