My husband has the Cayin N5iiS to go with the Topping NX4 DSD, both given by his brother. I have my Cayin N3/Topping NX4 combo which used to be his. With our respective gear we both listen to the HiFiMAN HE-400i (actually his that I borrow occasionally) for serious music.
In addition he has his Simgots (EM1, EM3 and EN700 Pro) while I have my KZs, Ostry KC06, Sennheiser IE80 and Philips SHP9500 (the latter 3 also used to be his). He also has this secretive grin which means he's been saving up for the HiFiMAN Ananda he can't stop talking about, which also means the HE-400i will be mine.
Yes, hand-me-downs I know but I'm not complaining.
The Atom is the dream amp he's settled on, in lieu of the Topping DX3s (a DAC/Amp) after amirm over at ASR tested and reviewed both; aside from being cheaper by far the Atom is TOTL transparent.