Yes the Yggy is a very good DAC for the money, and it all comes down to personal preference on it's sonic presentation. I found the Yggy to be a little forward though very detailed, kind of similar to Chord DACs. Great soundstge, very quick, yet a touch too detailed....but might be perfect for someone that likes that signature. I got fatigued listening after a few hours.
I love the Pontus II (now 12th), and as jjss49 suggests I found the Pontus II more engaging, mid bass had more "purpose", richer mids, and more of a warm sound. The addition of the Denafrips Iris DDC made everything more than a little bit better.
I have not listended to the Gustard so cannot offer an opinion.