Pros: easy to insert, sleek to maximize the pleasure without straining (like many dildos and "realistic" rabbits tend to do). Deep and rumbly vibrations my body loved instantaneously. Easy to climax, no struggle, no numbness. And truly whisper-quiet. The quietest vibrator I've ever had.
Cons: hard to find, but I would have liked *some* texture, however subtle, on its head. It would add an extra layer of sensation to external stimulation.
Something that can be both pro and con, depending on taste and circumstances: each time I used the Gii, it left not only a wonderful afterglow, but also a pleasurable and PERSISTENT - many hours - reverberation deep in my core. It's like walking around with the vibrator lodged in me for good. Hard to focus on daily activities in that state!