Herron VTSP1A comparison to CAT Ultimate MKII

Amp, source, and speakers aside, how do these top preamps compare sonically? The CAT's always get great reviews; however, the Herrons are less publicized but offer great performance....
Did you notice that someone is selling an ultimate II here on the 'gon for not so much money? Converted up from an ultimate I.
yes, it sold already.. I was interested but delayed to find out more info on it.