Hello designsfx!
The Romulus was the first piece of hifi gear I ever purchased that has tubes in it. My foray into the audio tube world continued after that with a 300b SET amp and a 300b push-pull integrated. Needless to say, I have been bitten by the notorious tube bug!
The tube rolling options are what really peaked my curiosity regarding the Lampizator DACs.
Which model are you using? Have you tried or listened to more than one?