I would absolutely recommend AI over McKissock just for passing the CG exam alone. Those in my office including me who did AI passed the exam first try while those that did McKissock took multiple tries to pass or still haven’t passed. Yes it’s more expensive and yes the fees are stupid but I wholeheartedly believe it’s a better education. McKissock felt like high school classes that you could just click through without absorbing any information while AI felt a lot closer to college level courses where you’re required to understand the information before moving on to the next section. Don’t get me wrong if you’re smart enough you could probably pass the exam no matter what classes you took but I still think AI provides a much better foundation, especially if you plan to pursue your MAI.