gongyo has been very challenging for me, but after just a few times through it using this app my pronunciation & ability to keep up are vastly improved.
as has been mentioned, there is a timing glitch in the daimoku which can be distracting. close listening reveals that the 4th & 8th repetitions (more pronounced on the 8th) are slightly slower than the others. it seems as if the person was chanting to a metronome or click track and slowed down there upon realizing he was "ahead of the measure". I am an audio engineer and could easily (and happily) fix this if I had a copy of the loop file. feel free to email it to me if you would like that done.
NMRK!
creatrixx about Nam Myoho