Im using it in hardcore on my lvl 80 ranger (farming merciless dock) and 8x lvl 25 witch (farming normal ledge) since 1 week, actually no death on my high lvl char, but 5 deaths on toons (time to make a good setup...) but since my setup is well no more death.
You need to be carefull, use external and internal chicken script (to be sure if one of them crash the 2nd can still chicken), and external potion script and an auto restart script, then everything gonna be fine.