Why would I think your opinion of a headphone is a put down to me personally?
Yes the Grado headphone amp is a simple amp and not worth over $400. That however does not mean it doesn’t sound good. Simple does not mean it sounds bad.
Also if you didn’t give the Grado headphones a proper audition how do you know they have mediocre sound?
I am by no means a Grado fanboy. I own and have owned countless different brands and models. The SR-60 is for me where it all began. We all have a soft spot for our first.