Got a little story about my experience with this site and Topping. Long time lurker here (and long time poster at the AVSForum). I have a Philharmonitor BMR desktop setup and a Philharmonic HT Tower (+ 18" Sealed Rhythmik) setup. I've been out of the DAC game for a long time (10+ years). Personally, I concluded they weren't the best use of money in a normal audio budget. With that said, I did enjoy the last DAC I owned way back when (the ol' Cambridge DacMagic). Eventually, I ended up moving onto Denon A/V receivers for all my setups, because I thought the Accessories4Less options were extremely competitive as "all in one" solutions (and I still believe that).
I have a computer-science background and this site wasn't much of a thing when I was last going down this rabbit hole. But once this site grew in popularity - it made me happy to see a community taking a pragmatic and technical approach to a downright predatory industry. In other words, this website made me feel comfortable going down this rabbit hole one more time. My ancient Onkyo TX-SR607, which powered my BMR monitors, died nearly 2 years ago. Without requiring much use out of that setup, I squeezed by with the cheapest Amazon DAC and T-Amp I could find (for less than $50 total). I've moved some months back and I have a larger living space where I can give my multiple HiFi setups more attention, so I started researching some options. My younger brother (who shares my audio setups) really wanted Schiit, so I was used their cheap DACs at a starting point for my product research, but quickly saw other brands that seemed more competitive for the price point.
Nabbed the Topping E30 II off Ebay for about $110 and a Fosi V3 desktop amp on sale. And I've really got to say - this modest audio setup really sings compared to the cheap A/V receivers it's been hooked up to. I ended up plugging the DAC into my main HT Tower audio setup (through my Marantz SR5014 receiver) to see if I could hear a difference, and my brother was so taken back by the difference that he had to order his own Topping DAC that evening. FWIW, the Marantz SR5014's DAC performance measured very poorly (likely due to its "golden ears" design), so this might've been one of the few scenario's where a DAC could make such a difference.
My brother wanted the E30 II but I nudged him towards the D50 III because in my opinion, it had worthwhile features for a small price difference. Particularly the EQ, because I use MiniDSP for my subwoofer and am very fond of it. When the D50 III arrived, he seemed pretty disappointed with it, and wanted to send it back for the E30 II. Apparently there's something about the Topping E30 II that sounded more pleasant. But before I let him do that, I decided to hook the E30 II back up to let him do some A/B comparison. Then we worked on figuring out the EQ software (which was confusing at first). But after an hour of fiddling around with it, we figured it out. And oh boy, this EQ software adds a lot of value to the package. I threw together some variations of house and the Harmon curve (some "safe" equalizations). Now he seems to be really impressed with it. And I am too. I've never had the opportunity to use a proper EQ outside of some awful software EQ (e.g. WinAmp's built in EQ).
In my case, I listen to a lot of metal music and rock music. Particularly lots of death metal and black metal, which can be challenging for a person who enjoys HiFi. I'd imagine many people would say the master mixes for some of the classics are practically sabotaged. Common production issues would be way too much treble with a tinny "scooped mids". Then, other death metal albums sound way too "flat" and traditionally mixed (which sounds less impressive compared to the dynamically mixed albums). I'm already in love with my speakers and their neutral sound signatures, so for me, EQ isn't about rebalancing the sound of my speakers, but making music that is nearly unlistenable at the source level into a downright enjoyable experience. And that's my 2-cents.