Just wanna give an update on this product (that I definitely DON'T recommend to anybody). After months of suffering with Cayin N5ii, their weak support, terrible device performance & almost-never-happened firmware updates, etc. The worst experience for 500$ ever in my life. Folks, I bought a 100$-DAP (Shanling M0) for jogging/gym and it's just amazing. For 100$ it does the same as Cayin N5ii but better. Yeah, yeah, sound-wise Cayin a little better, of course, but it's 500$ crap that works as a crap overall in terms of UI/UX/etc. And I'll continue saying that, and no, because people have to know what a crappy product this Chinese company produces and gives no care abt their customers when someone can produce a 100$-product that works like a charm. And the amount of issues with Cayin's DAP raises every month. How stupid I was to choose this DAP, because all that reviews are a couple-of-days articles that never say 100% true abt gadgets and pretend they are pros that can judge abt anything after 2 days of usage of any device, which covers mostly even less than a half of real device's performance/features.
Cayin, sorry, I'm angry with you. You, guys, you are the worst company on DAP's market. This is my opinion made by months of using your product that you never fix, never try to fix and even don't make proper excuses. Shame on you.
I get you're upset that your experience hasn't been great, but I think you crossed a line there. Sparing the "if you think you can do better, then do it" line that would be well-deserved here for DAP or software design or, hell, even reviewing a product, I don't think you demonstrate enough maturity for casual readers of this thread, let alone two representatives of a company who, from my perspective, have just gotten tired of the collective frustration and (often) whining of people who have either:
1) Shown a legitimate concern that their dev team can't reproduce/isolate/fix...USB audio being the most obvious at first. Took a while to confirm it.
2) Requested a feature that is, in the dev team's mind, on a lower priority than a bug fix
3) Continuously abused this thread as a glorified tech support forum, despite one user even going out of his way to create a separate thread just for that purpose
So try to look at it from the perspective of Cayin just being tired of the general filth that is dealing with being an online company. I went through 257 pages of this thread and wished I could have received 250 pages' worth of my time reading back due to effectively no useful input. A lot of users in this thread should be looking at what they could have done better to produce a more desirable outcome. For those who tried to maintain useful input through it all, thank you. That little bit of sanity went a long way and it's probably the only reason Andy hasn't completely abandoned the thread at this point.
I'm not willing to let Cayin completely off the hook for this, either. From my perspective, the support lifecycle on this product is far from complete, especially with the iiS variant being less than a year old. If you can provide whatever pushback is necessary to keep the dev budget open for these devices, I think you should, especially with the recurring issues with Play Services and USB audio. I do appreciate you asking users here as to whether the priority should be USB playback or the pause delay and, while it's not great that we have to make a choice, you still are willing to give us a choice anyway.
I'm going to end with a counterpoint to what seems to be a growing trend of outright slamming this device: think hard about what you want your DAP to do before you buy. If sound quality reigns supreme over all other criteria, then you're in line with Cayin's philosophy and I'd expect you'd be willing to handle the frustrations of a non-ideal user experience. If you need a great UI, even Andy had recommended alternatives that will better suit you.
For what it's worth, I've played almost exclusively offline Tidal content and purchases from Bandcamp on my iiS and don't have any complaints. UAPP runs just fine, right up to the first MQA software decode (no hardware MQA capability, though). Battery life, when running, outpaces the Opus#1 this replaced by a noticeable margin. Bluetooth connectivity is leagues more stable, too.
Just trying to make a case that a positive experience with this DAP is possible; just be realistic about what it does primarily and acknowledge it didn't necessarily meet the mark on some of the more ambitious features it set out to have.