Agreed. The "good" feeling was so terrifying, so alienatingly remote from any sanely-achieved accomplishment/reward that I have had a hard time ever taking it again, unless to cancel the effects of psychedlics.
FYI, I've taken 10mg Xanax during a trip that wasn't going well and it did literally nothing. Normally, 0.5mg would put me to sleep. Seroquel (Quetiapine), on the other hand, does work if you want an escape hatch and don't mind being sedated.