A slight curve is great for reaching those hard to get areas.
My sex toys so far have all incorporated a flat base, which is great for displaying on the bedside table, or using hands free. But for those times when you want to get more hands on, this is the perfect shape. Lie on your front or your back, or give it to your partner, and have a great time.
Technically this is a sculpture, so if you 'use' it, use protection.