I have Intona 7055-B and Coolgear USB 2.0 high speed isolators. I run them with home brew supplies for the output to keep switching noise out.
I have Chord Qutest and Benchmark DAC3 for main usage. Have a DAC2. Also picked up an RME ADI-2 based on a recommendation here. The Chord and Benchmark are almost impossible to tell apart if level matched. Not sure I could reliably. Have had other DACs from friends, some much more costly in system. Can't say any were better. Different, obviously intentionally, but not better. Picked up a Topping E30 to play with. With the isolator it is very good. Gave my son my Node2i. I would say the isolator and Topping is quite a bit superior but that is off memory.
I have Chord Qutest and Benchmark DAC3 for main usage. Have a DAC2. Also picked up an RME ADI-2 based on a recommendation here. The Chord and Benchmark are almost impossible to tell apart if level matched. Not sure I could reliably. Have had other DACs from friends, some much more costly in system. Can't say any were better. Different, obviously intentionally, but not better. Picked up a Topping E30 to play with. With the isolator it is very good. Gave my son my Node2i. I would say the isolator and Topping is quite a bit superior but that is off memory.