Well, hello Guidocorona,
Looking at the innards of the 302, it doesn't appear to be an analog power supply. I have heard, on good authority, it is not. However, I will graciously accept correction.
I am a former owner of the Pass Labs X600. Compared to the innards of the H2O, I'd say the H2O's power supply more resembles the Pass Labs analog power supply.
There is also the matter of cost. The very best H2O, M250 Signature mono blocks (2 larger amps) cost $5500 (not pictured), whereas the single Rowland is three times more costly.