Erik Y U Gotta Hate!

Both Pass and D’agostino amps are designed with purpose, and that’s to achieve a certain sound (vs perfect measurements). I’ve already pasted comments above from D’agostino implying this.

Here’s the other side of it from Pass Labs via Hometheatrehifi.

https://hometheaterhifi.com/reviews/amplifier/pass-labs-xs-preamplifier-and-xs-300-pure-class-a-monoblock-power-amplifiers/

At 20 volts output, the B-A peak is at -42 dB. If I had just looked at the graph, but never heard the amplifier, I would have predicted some audible distortion. But it didn’t occur. Here is the reason. Pass Labs used extremely high quality parts, a massive power supply, and more than 100 output devices. They created the sound by changing a capacitor or resistor here and there, but these were not band aids to fix problems. They were there to create a pleasing sound, one that was similar to a Pure Class A triode power amplifier (50 watts) that they designed beforehand, and decided that they would build the Xs 300 to mimic that sound, but not be deficient in the bass or high frequencies.

This should answer your question what people like about Pass Labs (for the same reason someone would like D’agostino amps).

To the couple Eric lovers, you must be blind, just look at his history of starting anti Pass Labs threads.
And this one started by markum01 OP is just a "retaliation thread" to the dirt digging anti Pass one Eric posted just 22hrs beforehand, wake up and smell the roses.
https://forum.audiogon.com/discussions/stereophile-pass-integrated-and-personal-taste

Be careful George you'll get your post censored and removed like I did by the almighty mods.

Hey George,  I've read a few of Eriks Non Lovin Pass threads,  there are plenty of brands that I don't love.  I find Erik constantly trying to come up with threads,  I find this helpful with this forum.  Alot of education goes on for our members because of those.  I don't know of anyone else that goes out of their way to keep new threads up like Erik does, so yes,  I occasionally get a bit aggravated with him also,  but appreciate his effort that he puts forth in our little group. I certainly would not call myself an Erik fan,  but he stirs alot of minds just as much as he aggravates others.  

I'm on my third Pass amp, also have a First Watt. Though 3 friends who have had and enjoyed Pass amps have moved on; VAC Integrated, Rowland, Belles...and we all very much like each others systems...