Chalker's 'trilogy' is something like 7 or 8 books by now, and as most such efforts do, the ones after the first went downhill fast.
I actually corresponded with him, pointing out terrible inconsistencies between the 'rules' laid down in the first book, which appeared in later ones. He just plain forgot his own rules.
Midnight at the Well of Souls was OK; I would not read past the third. Waste of time.
Sort of like Philip Jose Farmer's Riverworld in this respect, or Piers Anthony's Cluster.
BTW, have you noticed Chalker's fixation on people being transformed into other things? After a while it gets old.
--Boris