I just picked one of these up used on eBay for $1500. I'd heard the V1 AK120 and was really impressed, but I've been anxious to dive into some DSD files and haven't had a source that could handle the files native, until now.
My old digital source (besides an old iPod was a Mac Pro> Fidelio > Wyred4Sound DAC 2 (not upgraded for DSD) > Woo Audio WA5LE > Sennheiser HD800 or HifiMan HE1000. The HE has been my mainstay headphone since doing a Moon Audio cable upgrade, which eliminated my only complaint against the HE, lack of snare impact.
The new player goes direct into the WA5LE via AudioQuest Victoria mini to RCA. The WA5LE is single ended, so balanced is not an option.
Loading the player, as I've read on here, is an absolute chore. Originally I was using the MTP streaming app which took forever to transfer a file, even then it place all music in a download folder, but then I came across the Android File Transfer program, which sped things along-- though AFT was crashes quite a bit more than I'd prefer.
I noted immediately WAV files are not liked by the AK240. They play just fine, but most of the metadata, particularly the artwork, gets lost in translation. I converted my main WAV files (a bunch of McCartney unlimited files and Harrison's All Things Must Pass) to FLAC, and viola, my tags and artwork appeared.
Launching a DSD copy of Cannonball Adderley - Something Else, I immediately was hearing an overall improvement in soundstage and imaging. I A/B compared the Rolling Stones Let It Bleed between the Fidelio hires and DSD on the AK240 and there's an obvious sound upgrade coming from DSD files, I'm sold on DSD. I switched to Miles Davis - Kind Of Blue DSD and it was game over. It sounds better than the just-released MOFI 45 RPM version on vinyl. It's the best KOB experience I've ever heard. Hugh Masekala I again A/B'd from Fidelio hires, and there's just more "there" there in the DSD.
I'm blown away by what this little player can achieve. I do wonder what's to be had at the AK380 level, but for $1500 bucks, I'm not changing again anytime soon. Re-discovering my favorite tracks all over again. This is serious audiophile heaven.