Our campaign's Vakeshi mystic did not take the prestige class - they were already doing some serious coffeelock shenanigans with the build - easily the most cheatsy build of the party (with my well-timed +1 bard casting level coming in a distant second). I don't remember the final levels of the...
Not to necro an old thread, but to totally necro an old thread for anyone who discovers this via search like I did just now - my group just finished a full 5-year playthrough of the 5e Zeitgeist adventure path, and several of us took levels in the prestige classes. We considered them as working...