Most of the time, I gush more like a faucet; I can feel the streams of fluid going down my ass cheeks, and pooling below me. However, sometimes it squirts straight out like you see in porn, though that is not as common. That only happens once in a while, and usually it's when I'm jerking myself off and using my pure wand. I also have to be really horny/desperate to come.
With a partner, 98% of the time it does the "gushing" thing more often than the "squirting" thing. I can do it on command (squirting in general, not choosing if I want faucet or waterpik), but it requires me to push it out. That involves pushing from somewhere inside my vagina, flexing my kegels to squirt.
I don't always feel the squirting though. The easiest way for me to tell is to look below me when I'm done. The wet spot totally gives me away.