just got my vice . it sureis bigger ten the helix. but slides in easy. the vibrator really stimulates the anus and sphinster muscles. i have not achieved the super o yet but i believe the vice will get me there. i like the long stroking sincation the vibrater provides,i can feel it from my anus to the prostate. the vice by it self fits like a glove and provides better stimulation of the prostate. well worth the wait!