I've never had any bad experiences with ecstasy.
Check your pills before taking them and get a testing kit if you can...there are a lot of fakes out there.
www.ecstasydata.com
www.dancesafe.org
www.pillreports.com - World Wide Reports
MDMA Causes your brain to flood with serotonin, which is a neurotransmitter responsible for feelings of happiness. Users generally don't feel 'depressed' until the days after with frequent use due to a lack of serotonin in the brain.
With real MDMA the risk of death is very low, millions of pills are consumed each year and few deaths occur.