I`m in no position to declare the Duelund CAST the best capacitor ever. I used the tin foil V-Caps in my 100 watt push-pull tube amp and the OIMP V-Cap in a preamp. The results were very good and certainly worthwhile.
My recent use of the CAST capacitors in my speaker and DAC has been fabulous! The CAST have a larger impact and could be considered near profound in effect(no hyperbole). I spent 850.00 for the speakers CAST (one pair) and 440.00 for CAST to go into the DAC(one pair output caps). I can`t imagine any better use of money to improve audio components(and these were already very good sounding respectively).
So for 1300.00 USD the overall level of my system has been raised an entire level,there is`nt a single downside or compromise either. I think it`s quite special(and rare) to increase system resolution, nuance and clarity yet get more 'natural' sound and tone also.
I don`t know that this amount of money spent on cables or other upgrade attempts will come close to what the CAST capacitors have done so convincingly.
I think the CAST given its stunning contribution is an underated and under appreciated product in the audiophile community.
Regards,