The One X is my first android phone. I have been on iOS for 3 years, and decided it was time for a change. I have to say that I love the One X. Sense isn't as bug-free as iOS, to set the record straight, but it's still great to use. For me, I am finding myself doing more on the One X at one time, then I did on my iPhone. Maybe that's just the freedom of Android. Regardless of what I am doing, the phone is super fast.
I'd recommend giving it a try. I've had my phone for less than a week and I'm already wondering why it took me so long to switch. This is an amazing phone to jump into Android with.