If you need a passive they are great. My first Tap was a revelation since I had a audio aero capitols amp and compared it to the joule pre at the time. It was more resolved and I felt the notes floated into the room, I loved it. My second balanced Tap was with Atma amps which had attenuators on them already. The differences between the balanced Tap and amp attenuators was negligible. So it was a expensive remote at the time.
The Bent is about as transparent as it gets. the Dude matches that transparency,but the bass, dynamics and staging is what really set the latter apart. Going from cheap MIT caps to Duelund cast should be another revelation from what I hear.