I felt largely the same both times I bought the Sundara. The sound is indeed beautiful, but somehow lifeless at the same time. I like to describe them as literally having two walls of sound on either side of your head. The walls are a a good width apart, but they're just vertical walls with seemingly no layering or depth.

I think because of this lack of layering and depth, it makes them sound sort of lifeless unfortunately. It's really obvious if you try to game with them. The lack of dynamics becomes readily apparent.

Still their sound is beautiful. The airiness is incredible, and though they are a touch bright to me I think the overall tuning is amazing.

But like you said, the comfort and build is just not for daily wear.