The lowdown on ecstasy:
No hallucinations but definitely a change of perception as people have mentioned. It's a great drug but if you're doing it the first time, you should probably just take one pill. I took 2 pills after 3 years of not doing it, and I was beat the next day. I felt so nauseous, and my entire day was ruined. So try one.
As for it being addictive, yes it can be. The high is amazing and you'll probably want to experience that again. But, if you have the willpower, you can use it once in a while and have a blast.
I defintitely think you should have a friend with you when you roll for the first time. It's a pretty strong drug, so just be on the safe side.
Drink water when you're rolling, try to lay off the alcohol becuase it'll only dehydrate you and make you tired. When the high starts to wear off, smoke a joint. In my opinion, it really takes the edge off of coming down (which is kinda depressing).
Ecstasy is a great and fun drug, just use it safely and you'll be fine.