I'll tell you where I'm coming from... I've been using my Mojo connected to a Soloist (full 4W version) for my LCD-3s (latest drivers, so 110 ohms), as when I first tried them with and without the amp I preferred them with it.
When I heard about the Qutest coming out I thought great, it can replace the Mojo in that setup and I will get a better sound, will not need to keep moving the Mojo between my home and portable rig, and will not have to worry about overusing the battery.
Then I read that Rob Watts doesn't recommend the Qutest to be used with headphone amps and that it's better to just get a Hugo2 for that...
So to help myself decide on whether or not to get the Qutest, I once again compared the Mojo with and without the amp and this time I wasn't sure what I preferred... the amp adds fullness (phatness?) to the sound and I think also some treble energy that makes things sound more spacious. But on the other hand, without the amp the sound seems more cohesive and controlled.
So now I'm in a bit of a pickle