I did read the test.
Did you read the James Cook’s posts about conversion and clocking ?
(dCS Ring DAC - A Technical Explanation)
If you can try out the Puccini clock in your system before buying then do it (and rely on what your ears will tell you).
IMHO the idea behind upgrading is 'how can I get the highest improvement for my limited money".
May be the bottom line of my previous post was a bit too radical, but it was in some way based upon my own HiFi history.
I exclusively use solid state amps since 1974 (Marantz made in USA, later Accuphase). For me tube amps are history.
The change from my first CD player (1985, Marantz CD 74) to an Accuphase (1989) was a huge leap forward. For me Philips DAC chips are history.
The change from an Accuphase DAC to dCS gear (2002) was the next huge leap forward. The purchase of a Vivaldi DAC and recently a NB resulted in even more progress. A fanless NAS should be delivered this month.
Changes were always ‘dictated’ through the requirement to match the quality level of the loudspeakers.