I (just) own the Onyx Boox, the black seem quite good. I can only compare to my previously owned Irex. (If you ever go to a beach with an ereading device...remember they are not waterproof!!

)
I've got the new 1.2.1 firmware installed. And it already includes the fixes (e.a. Wifi) that Bebook claims to have fixed, so I guess the device is basically the same (except for the integrated store). I picked it up for €339.
I've got a discount code for a €10 discount for those interested in the device: 1200148QP60ONYXBOOX (ebookreaderdiscounter.com)