Intona is a great piece and they have indeed a great service, for a "poluted PC" it does a great job

I used to have one intona and after that 2 regen in series with linear power supplies.

I put that in the garage, because I found this amazing device the 3R by ideon audio.

I also use 2 in series but with one you get 85% of the improvement

It is cheaper than the intona, and works way better [than the regen as well]