depends on your deck, most D8/D7/M1 users won't use them because the belief is that the motors in the smaller dats are not strong enough to pull 90's so the motors wear out prematurely, on the other hand many DAP1 users like myself absolutely love 90 meters, we just press record/play and forget about it until the show is over and rarely have to switch out the 90's for another blank, sure makes things easy and avoids missed songs/cuts during recording