NAIM: Nait 1 versus Nait 2

Is there much (if any) upgrade from a nait 1 to a nait 2. I'm really happy with my nait 1 paired with Totem Mite's but have been looking out for an Olive Nait 2 (for a reasonable price). Would I notice much of an upgrade or should I stick with my nait 1? I would never sell my nait 1 and probably lose my 90/92R combo. Just interested to hear peoples views to stop my incessant searching. Thanks

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