Is Nelson's pre as good as his amp ?


Just wonder is it worth to replace my arc ls-3 with aleph p ? This wonder is based on very satisfied experience with aleph amp (first 5 then 2). OTOH, one stereophile's reviewer seemed to prefer AI M-3. Any thought ?
cdma

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Any one know what is the hardware and sound difference between v1.0 and v.1.7 in addition to the spec in service manual? Thanks !