Stay away from the commercial outlines/notecards/study aids. I haven't used a single one, and I am top 3% transferring to Georgetown in the fall. There is no need to be in the library with 3 different study aids for contracts. Do the reading. Go to Class. Make your own outlines/notecards.
There is more than one way to skin a cat.
As a rising 2L at a T25 school, I know plenty of other students who spent their time making their own outlines and did very well, but I did not write a single outline for the entire year. I either used outlines that I snagged from upperclassmen or commercial outlines. While I don't have my spring grades yet, my first semester grades were very good. Basically, after taking a class, you'll know what kind of study aids will or won't help you. Use them during the semester to see if they work for you. They don't cost that much and they might just be a lifesaver.
I had a Contracts professor in the fall that confused me so much I had no idea what was going on. In the last few weeks before the exam I read through the Contracts E&E and the Contracts Crunchtime. I ended up with an A in the class. I'm not suggesting that commercial outlines work the best, but don't be afraid to use them if you feel that they might help you.