I can relate. Very similar history with Path Finder and PF8 experience for me. I'm done done done! And I'm afraid I didn't give up soon enough, kept fussing with it thinking I was doing something wrong. Hunting solutions out on the net and trying to communicate with until my frustration just boiled over. I wasn't nearly as kind to them in my thread as you were in yours.
Now, at the end of a couple of days of this BS, and already running ForkLift 3, I'm just reading through a few others' threads about PF8, before I leave this site once and for all. I'm interested because I think there are important lessons here about product development, customer support, and how a company can screw up. It will be interesting to watch and see if they pull out of this or crash.
I have been using the Finder lately and it is a lot better than I remember. I guess I was using PF for so long. Mac is nice and snappy and I don't worry or check how much memory PF is consuming before it drag down or causes the mac to hang.