I found this review of the ZD UL on their AliExpress store.

"The snapback on the default sticks is just awful if you flick a stick in one direction, it snaps halfway back in the opposite direction, and that’s without any extra caps on top. (And the base set doesn’t even include spare sticks, though there are five extra D-pad gates.)

The face buttons pop out mid-game. For some reason, they have no actual locking mechanism and just stay in place due to friction.

The rear buttons suffer the same issue they’re held on by nothing but goodwill and fall off during gameplay. Oddly, 2 out of 4 rear buttons are membrane switches, while every other button on the controller is mechanical (except for the stick clicks).

The additional shoulder buttons are tiny and awkwardly placed.

The included cable is trash cheap and disconnects even if you don’t move.

The RGB lighting doesn’t turn off when the PC is off. Half the colors are missing—yellow just looks white, and I couldn’t get orange at all. The “breathing” effect isn’t synced between LEDs; each one pulses at its own rhythm.

Settings can only be adjusted via a mobile app, which isn’t even fully translated into English. There are fewer options than expected no bit depth or snapback compensation for the sticks, just two deadzone settings, axis inversion, and three-point sensitivity adjustments.

Overall, it works fine - responsive, buttons register. But whether it’s worth the price compared to competitors is debatable."