Ambivalent
The games are clever at times, and I like most of them. Some of the word games are vexing because the game is obeying strict rules while the use of language is fluid and creative.
Ive found that there is a ceiling to the use of the app without paying, and a subscription service seems pretty ridiculous for something like this. I might purchase the app, but certainly not subscribe.
LeafofGrass about
Peak - Brain Training, v2.14