I would confirm this suggestion, I had a fiio x1 II and it was a complete peice of junk, and fiio customer service was not existent, no updates and I spent $120 on it, it sounded fairly digital, froze up and crashed every hour or so, then I got the fiio x3 III and though it sounded better, it was fairly laggy and I didn't feel the price was worth it.
So I searched, tried some ibasso and some of xduoo and I liked them alot but $300+ was just too steep.
Then I listened to the dsd, I couldn't believe it was about the same price as the x1 but sounded (to my ears) better then the x3, so I bought 2, the ak4490 version and the ak4497 version.
Modded the ak4497 2xad8620 and opa1622 upgraded ldo's and capacitor 4x220 uf 6.3v and 2 330uf 6.3v, added a 2x16850 battery holder and modded the case
The ak4490 version I have stock for now but they are awesome players
Then again, I don't use Bluetooth(why invest in a high def player, download lossless, and use high def earphones if your going to stream it in lower quality) I don't use wifi, not interested in anything hyped by marketing. I keep one for travel and one for home use/work
If you want a no frills beast of a player zishan dsd doesn't disappoint...... But if you only use low impedance go with ak4490 or ak4495 (twist nob) if you got higher impedance gear then ak4497 or ak4495
Ak4495 is the most versatile