The Ultrajitterbug is one of the worst I have heard - definitely try before you buy. Part of the reason for less popularity is that the standards changes upset things and the DACs are getting better.
Best Jitter reduction device.
In your experiences, what is the best jitter reduction device? I'm thinking of AA DTI-Pro or Sonic Frontiers Ultrajitterbug. I want balanced input/output. Is there anything else out there that compares with these two? Why don't these things seem popular anymore? This type of device was big in the mid 90's.