I've used them a few times so far. They work great with rub-ons. I used the Fashion District Rub-ons and the Bright Delights rub-ons with the canvas cuts.
Inking them up with craft I haven't tried, but swiping the edges in Classic ink (make sure your pad is juicy) worked for me.
I have to experiment some more with these, but this is what I've done so far.
See 2 of my cards here:
http://creativecucina.com/?p=537
http://creativecucina.com/?p=421