Great thread.
I started streaming in my main rig a little over three years ago (almost all components and speakers new at that time). I've found that in a good system, everything makes a difference; streamer, DAC, network cables, power cables, network switch, linear power supplies, etc. I make small changes as I feel and have gotten to a point that it is so, so good! Can it get better, I think it can, but right now I love listening and never wonder what it'd be like with a vinyl rig, I can listen at my local dealer anytime. Next change is power conditioning, just picked up today.
BTW, streaming just opens one up to such a wonderful universe of music. Been selling or giving away CDs and need to get rid of them all, or most. Maybe someday I'll get to ripping the CDs that are out of print that I want to listen to in the future.
Yes, this is a different world. And one I so love sitting down in front of.