Wow - high praise and cheap to investigate. I have a Pono which does indeed have a great headphone amp and a 1st gen Fiio X5 which is alright at best - will definitely keep it on the radar...
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I have the Fiio with the outboard Mont Blanc amp. I haven't tried the Mont Blank with the BTR3, but so far I don't need to.
One of my goals here was to stop travelling with my (allegedly) audiophile LG V30, and my Fiio X5 AND the portable amp.
I keep the phone, but man, the sound is so much better.
There are some static issues I am discovering, but at my desk I usually don't notice.
My usual IEM's are the Shure E4's, and my desktops are ESS 422H. They make the 422's sound amazing.