Couldn't find an independent thread about the Qi, so I figured I'd post here.
My knowledge of Yikun discs is very limited. The only other one I've tried prior was the Twin Swords. The Twin Swords is an overmold driver similar to something Axiom/MVP would put out. Frankly, I thought the Twin Swords sucked. It flew nothing like the flight numbers suggest, and I could find no redeeming qualities in the disc.
That brings us to the Qi. The Qi is not an overmold disc, and seems to be made out of some clear, Z/champion type plastic. The plastic itself seems nice. No durability issues.
I found the Qi to be a mess overall. The flight numbers given for the Qi are 13, 6, -2, 2. After a few throws it was readily evident that the Qi is SUBSTANTIALLY less stable than the numbers indicate. Upwind or downwind, the disc would flip over violently even when released from a pretty steep hyzer angle. Out of about 15 throws I had 0 that stayed flat enough to complete their flight.
The Qi has a decent hand feel, and I actually like the plastic. It's 171g, and pretty flat. No real dome. The disc came out of my hand well, and actually penetrated decently. It would have been a long flier if it didn't want to go dive bombing right on every toss.
The Qi's rim isn't super wide (2.3 cm), and the mold reminds me a lot of a Sorcerer based on look and feel. This isn't a very good thing, as I also found the Sorcerer to be a lousy flier. I'm not sure who would benefit from using the Qi. It's WAAAYYYY too flippy for its speed, and has absolutely 0 late stability to bring it back toward center once it flips. Half the throws I did with the Qi resulted in "throllers". The Qi is one of the flippiest drivers I've ever thrown, and even a Mamba does better at producing good lines on hard rips.
Qi: 13, 5, -5, 2. WAAAAYYYYYY too flippy to use for any sort of distance. I figured the Qi might perform downwind, but even then it wanted to flip all over the place.
Sorry, Yikun. So far you're 0/2 with me on discs. The Qi and Twin Swords suck, and there are literally a HUNDRED other similar molds that can produce the same flights, but so much better.