Best, and worst
is the Topping PA5 amplifier
My first foray into a measurement-based purchase, this change in thinking stopped my "hi-fi" upgrade plans dead and saved me a ton of money.
But ... I was an early adopter, buying soon after Amirm's review and before the problems were reported. Mine promptly failed and I spent frustrating weeks trying to get it repaired (I'd missed the return window).
That was a learning experience!
It's repaired now, and honestly it's just a brilliant wee amp. A constant reminder to do due diligence before buying, and also that great electronics don't have to be expensive. I live with occasional fear that it will fail again - but I've had it long enough now to be happy and I know I can replace it with something better for not very much money at all.
More importantly, I spend more time enjoying music and less time thinking it would sound better if I just bought better cables.
Everything I've bought since has been brilliant (WiiM mini, Genelec 8030C, Matrix Audio i2s, Topping L50, Sennheiser 560)