I have already written something about Feliks here.
I don’t have a bad impression of him.
I’m beginning to understand it and realise that it’s quite solid and well-built, and the sound is a bit tricky.
With a good set of tubes you quickly warm up to it.
It does have one shortcoming when it comes to planar headphones, that it is too neutral and has to help a bit.
But when that is eliminated, it sounds damn good with planar headphones.
I haven’t quite finished the test yet.
But all in all, it’s really very solid and its sound is even better than the Singxer Sda2.