It really depends on your anatomy and what gets you off.
If it can hit your g-spot, that'll do something, but it varies person-to-person how much. It might hit your clitoris, but again depends on how the toy fits your body - and if you can get off from that kind of stimulation.
Personally, I don't rely on it to get me "all the way" all by itself - because I can't orgasm so far with just g-spot and clitoral touching. Some people certainly can, it just depends.