I cant speak to the efficacy because Ive only used this four minutes and I actually bought it for my husband.
The app works smoothly in the iPad, but is really only designed for iPhones. You must keep your iPad in the vertical orientation and if you want it full screen, you have to just use the "2x" magnification button.
Things I would like to see in the next version:
Options to have more faces on one screen for the iPad.
Ability to use the app with the iPad horizontally, as would be comfortable if I wanted to prop it on the table and do it while eating breakfast.
The ability to have multiple users.
Better tracking of scores and analytics, saving scores, dates, and times used for each user.
Yosefa4 about Mood Mint – Boost Your Mood