Well, after playing with one of these for a good part of a year, I'd say that you shouldn't get one of these unless you have a decent vivado license. Also, the schematic and board layout are not released, and the system code is very unmaintained (I had to compile my own fsbl and uboot so that it would work with a reasonably recent kernel, so I ended up throwing away their code). I tried to mainline my uboot port, but I think the board was a little too proprietary to have it accepted.
However, as a zynq development kit for $266, I'm considering buying one for me (the one I have is for work). It's the closest thing to an open source oscilloscope that I've been able to find so far, and if you want to do some fast dsp then it is also one of the cheapest. It's definitely cheaper than putting an fpga and add/dac combo on the board yourself (those three chips alone add up to about $150).
Perhaps they are half price because there is a new one coming?