I like the article. It can lead to some great discussion.
I was most interested in the discussion regarding cash. The author didn't "see the light" until she switched to cash only for transactions. But she didn't see the light at all. She commits to taking out $250 a week, and when its gone its gone.... until month 2 when she spent more.
I feel this is totally backwards. To truly get a handle on spending, you need to track it. She admits she has no interest in keeping track of spending. A credit card trail locks in the record. You can see it FOREVER. You can compare month to month, year by year. You can not "hide" a latte, or a nice pair of earrings, etc. She even admits she still does not know what she spends her money on(80-100 for groceries is not at all accurate enough), only that she spends all her allotted money.
If you are not committed to tracking spending, I feel you MUST use credit, so that transaction is recorded and can be assessed at a later date.