The best replacement for z523 is z623.

The best alternatives to z523 are rated as following:
★★★★★  z623
★★★★  z506
★★★  z323
★★★  z313
★★  ca-3602
★★  x530
★★  z2300
★  vs4621
★  bose companion 2
★  z553

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z523
z623
z506