I purchased Royal Flush (the $200 one). I figured I could benefit from the extra practice questions. Too bad there aren't any extra TFE problems because that is the section I struggle with the most.
I bought the Ace edition (the ~$100 one w/ 10 tests). I REALLY like this one because it was $100 cheaper than the other and has sooo many practice tests. I will do almost all of them 2x each...
i purchased the king version ($70) only did 4 tests....really never had the time to spend on more practice for this considering bIo, GC, OC and QR! Got a 24.