http://www.beeradvocate.com/community/threads/fast-pitch-canned-wort-thoughts.320951/ based on the thread responses doubt anybody has tried it from this crew....but maybe not.
It has my curiosity, because it would be convenient, but I don't understand why they made it so you have to add water. I'd prefer to just pour directly from the can into a flask and pitch the yeast.
That's weird. It seems to defeat the purpose. You are just buying diluted extra that still needs to be diluted more, which forces you to go through the boiling sanitation process that I thought this was intended to circumvent.
I'd be comfortable diluting with a freshly opened bottle of distilled water. Once you have a flask though making a starter "from scratch" just isn't that much effort.
I know this has been discussed before, but making your own wort and canning it in mason jars for future use is just as convenient and time saving. It's pretty cheap to do either way, but in the end you save about half the price making your own as you would buying the canned wort.
I can my own wort, but at 3x the strength of what I want. I take the Mason jar I'm going to use and add 2x that volume of bottled water to the flask, then the canned wort, then aerate, then add yeast. I've never had issues, and get 3x as much wort per canning batch. I can can 7 quarts and 7 pints at a time.