This is probably one of the most resolving, technical IEMs available at the ~100 dollar price bracket. That in itself is an accomplishment. But I also own a pair of Hexas.
The Diokos are better in all the traits mentioned earlier, and harbours better bass soundstage. Whereas on the Hexa, the bass is more closed-off, narrow, and so on. It's been interesting comparing the two, as I have similar expectations for products at similar prices, and they are similar in overall performance, but for very different reasons.
Thing is, the Diokos are just not very well-tuned. Or at least, it is, until you hear the horrific, shrill treble peaks at ~7 and ~12KHz. They ruined the sound and made this IEM pretty unbearable for me until I EQed them. Then, I felt as if I tamed a beast. These are really good with EQ and the comments below also mention that. I find the planar timbre unideal, but not bothersome. Vocals were a tad shaky and everything seemed to have a metallic sheen, with or without EQ, but again, the amount of detail these pair of IEMs can extract is impressive. So perhaps they're not for casual listeners, but for those who want their music meticulously dissected at a reasonable price, and are willing to dive into EQing.
Regarding the Hexas, even though they do have (so-called) BA Timbre, I find that to be less artificial than planar timbre. It's the difference between music sounding "plastic-y" and "metallic-y", the latter of which I notice a bit more. Dynamic drivers are still the golden standard. Otherwise, out of the box, they are better tuned, and owing to their multiple drivers, are better at distinguishing and making distinctive the separate sonic elements of a song in its soundstage. In comparison, the Diokos are wider and a bit more expansive. As a package, out of the box, I'd argue the Hexas are a better product. But I by no means, regret purchasing the Diokos. I've owned them for almost half a year at this point, and still occasionally use them. The fit can be a bit loose, though.
These have their place in the market. The unconventional design, myriad accessories and planar technology make these quite unique at this price. I think it's worth a consideration if you're a beginner audiophile, and want to take a gamble at your first purchase. I highly recommend these for musicians or audio engineers. If you're a bit more risk-averse, go for the Hexas. You can't go wrong with it. But these are way sexier.