I think the cordless was designed for commercial maintenance work / touch ups on a spray finish. Also I think it would be a good prospect for finishing one-off front doors, as demo-ed by Jack Pauhl, which is a high value task, and would therefore reduce the pain of the cost per litre of usage.
I am pretty sure I saw the latest incarnation of the Graco cordless is now good for one more repack before it is thrown in the bin, which may be an advance worth considering.
At the 2011 P&D show, fortunately I had already read JP’s review of the machine and had decided against it. However, it didnt stop me asking the sales guy to try and convince me, one more time. I was quite surprised how he omitted to mention the re-packing predicament! That is now common knowledge.