"Exact same thing except the logo. Firmware update to change the Benq branding to Zowie. Nothing more. Haven't you heard of price gouging before? The XL2420Z was $200 more than the XL2430T and XL2411Z because Benq discontinued it, as the XL2430T was supposed to "replace" it, despite the XL2430T being worse (firmware bugs, preset color gamer profile bugs) than the V4 firmware XL2420Z.
Look what happened when the Samsung HMX-F90 camera got discontinued? It used to be available from Amazon for $120 and Walmart for that same price (I got it for $120) even though it retailed for much more originally. After it got discontinued, people were price gouging for $299."
taken from reddit