A small review from myself - I owned both players - very decent devices, with a wonderful sound, which after a little refinement begin to sound even better!
The simplest refinement is a change in the chip of the operational amplifier, which is located in the connector and is changed by a simple interchange. The cost of a good replacement of about 200 rubles for example, personally tested not only by me.
LM6172.
The impression from the sound of some spoils the cost and simplicity of the subject, they would be packed in a different case and would have a price of 150 bucks - there would be much more laudatory comments (this is my subjective opinion).
It is unfair that on 4kpk there was no topic for these players.