i have smart balls and a glass set of Ben Wa balls(never used those before tho)

personally for me, i enjoy my smart balls, but after awhile they do get uncomfy for me but ive had mine in for about 4hrs lol. i would take them out, when i had to pee but i would clean and reinsert them back inside me. I guess it depends on the person, how big they are and how long she plans on wearing them.