Overall, this is a good series, and I highly recommend it. However, between this edition and the previous one, there have been no noticeable content changes. (I compared both side-to-side.) The one change I did notice was the print quality had gone way down. The previous version cards were done on higher quality "stock" paper and these are on flimsy paper. You will spend alot of time learning these "bugs" and will probably add alot of your own notes in the process. I don't think these cards can withstand that kind of wear-n-tear. Therefore, I recommend buying the previous version. Get better quality for less money!