Soon. It's gone through a 48-72 hr burn-in so far. But today I've taken it out with me to work and currently giving it a listen. However I'm the kinda chap who needs a base reference to compare against and today I've whipped out only the -dB/CLAP & HM-901 (with balanced amp module). Some initial play around is that it hiss level appears to be as much as the Duet - in other words, if you don't hear the hiss in the Duet, you probably won't hear it on the CLAP (on low gain). OTOH if you do hear hiss on the Duet (and it's very very slight hint of hiss), it seems to be the same with the CLAP too.
There's also a very slight pot scratch but minimal. Not as clean as thet Duet or Theorem 720 but still negligible.
FYI: any sonic thoughts from me take ages 'cos I don't really like to hear once and regurgitate. I'd rather hear the same setup numerous times on different days and average my thoughts. I don't always hear the same thing every single time I listen - even if it's the same setup, same music, etc.