303 on right, x0x on left.
On the right channel the square wave sounds more hollow and fluid when the filter is closed with low resonance which sounds more like a 303 to my ears, I have been using 303's for 17 years and have never heard any clone do the square wave with low filter accurately. Of course I could be wrong in and the way the two are tweaked differs a fair bit so it could just be this.
Either way the x0x is a great sounding clone and at times it is very difficult to tell which is which, but at around 3.58 on the second clip that sounds exactly like a 303 on the right channel. If I am wrong then the x0x actually sounds better to my ears!
Congratulations, glad I'm on the waiting list