I have an Onyx 1640 and I absolutely love it. For what it is, and the gigs it fills, It is what it is. It sounds fine to me, the EQ is usable, its been rock solid and reliable for over 3 years. Far more reliable than the old 1604s. I actually wouldnt mind a second one floating around. Havent used the ZED but in the store I felt like the onyx had a few more features like (I believe) 2 more auxes, pre/post switch on all auxes, Phantom on each individual channel and an EQ in/out switch. The Perkins EQ also has sweep-able high mids and lown mids on the onyx.