Stealth "Varidig" rca cable is it worth buying?

I recently had a fellow audio enthusiast bring by a "Nirvana " transmission digital cable .We put it in my system replacing a Acoustic Zen ecmz2 and i was floored by the difference in low level retrieval and mid bass response,airy and the soundstage was better by a lot.

Then he told me that the Varidig was even better-not the Sextet but Stealth's standard digital cable.The $850 price
on this cable is steep but if it can be better than the Nirvana @ $650 it will get my wallet open.

Anybody have this cable that can give some input?

thanks