Yeh i have over done it, i used 450 on 2 consecutive nights. I was a fool doing it i would of probably of been alright if i had kept it one night use. But that second night resulted in me blowing every ounce of serotonin i almost i had an anxiety attack after second night. Tbh i blew it all the first night. 400-450 mg isn't an MDMA experience its more of an overdose that will give you full blown visuals and make you sweat so bad. Some people would not enjoy riding that out at all. I had a week long come down and brain zaps wasnt nice, also had major mood swings from angry, crying, depression, back to normal again, couldn't eat shit for 2 days my bottom lip was hanging off my face.
Stick to 200 unless you want a similar experience.
You are right though, there was a 15 year old girl that died taking half a gram of MDMA for a first time, most i have ever come up on is 300 mg and that was extreme, i think 500 at once might even kill me