Looks super cool, and I love that the headphone out is separate from the line outs, but otherwise I'm not sure it's a huge improvement over the original Duet. I personally prefer the original being FireWire based, as well.
That said, I *just* bought an original Duet last week, so I'm probably trying to justify that in a way.
At the level the original Duet is at, it's definitely not converters holding your productions back!
The softlimit is kind of cool but I feel like if I'm just careful about peaks I can avoid the need for them. Balanced out's is pretty cool, too, but I've not had any issues running it into my Level Pilot and then into my Adams, although I can imagine balanced would be nice for live usage?
I've read about engineers using softlimit during the mastering stage to get a few extra dB out of a song because you can push the converters harder. I think it was Lasse that posted about doing this?
I have zero issues with latency or drivers on my Duet. I have to go maybe 1 buffer setting lower than on my RME to get the same latency, but I notice zero latency when playing through an amp-sim at 128 samples on either device.