Well..
This little gadget is very cool. On my 3rd record so far. I haven't played around with all the settings which include:
-3 types of tube sound signatures: classic tube, set, and push-pull
-3 sound stage signatures: normal, enhanced, and 30* enhanced
-3 Bass signatures: none, +6db, and +12b
I've been using classic tube, enhanced soundstage, and no bass boost.
There is no loss in detail, but much better warmth, air, and soundstage. I guess this thing does exactly what its supposed to do.
Build quality is excellent, and placement is easy since it's so small. I've used iFi products before, but placement was always a PITA, because the inputs & outputs were on opposite sides of the unit. Not the case here.
More listening to do, but I'm very happy with my initial impressions, and highly recommend the iTube2. So much fun, for so little $$$
Now I wish I could try it with a 2170 - Room Perfect and tube goodness. Might be a very cool match.