Free vs. commercial SJPhone, SIPPS, etc

Hello, Could anyone say if there is any significant boost in voice quality with the commercial SJPhone (payed for) vs. their free version?

Also, any reports on SIPPS free vs commercial?

It is worth to buy the licenced SJPhone/SIPPS to increase the voice quality (they want $95 for it, pretty expensive for a softphone)?

Thanks, Roman Zhovtulya

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Roman Zhovtulya
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