the product indeed is very appealing for people in the vfx/design industry.
I'm still concerned on performance with a retina display and current OSX. with the cintiq 13hd/companions you have a 1920x1080 resolution wich gives more workspace, with the 15" retina you will have to use scaled mode wich delivers poor pixel accuracy and laggy performance with complex brushes, colors are not as good as the cintiq 13 hd display.
add also osx that since 10.8 added nothing but issues for wacom users (brilliant ideas such as removing pan functions from preview
, increased overhead on wacom drivers wich use more cpu and have higher latency - main reason why I still stick with SL and Lion on my Cintiq-powered systems - 10.9 is a disaster for 3d in general, too many software issues).
But heat will be the number one issue. The cintiq companion get quite warm with lesser hardware specs. This one will be a stove, worse than the first cintiq 21UX "