I went for the 4.4 to use with my balanced DAC
It's really nice and soft. Good match IMO; very lightweight.
I already have a separate 3.5 mmcx cable for use on my phone anyway.
Oh yeah. Much easier to drive than a P1 for instance. It's rated at just under 15ohms and 104db. When I first unboxed it, I plugged directly into my phone's own jack, and even without a dongle, I was surprised by how responsive it is. I suspect this may have been engineered with dongle DAC's in mind. ;)
they can be linear depending if you want to change out the cable.... with the cable that it comes with its V shaped.... I put a very thin cable on them and they are very linear now....