Yes, I too had problems -- especially at the part when it tries to "detect" previous installation.
I had a IDE RAID (Mirror) system, where I couldn't intall RH9. Later on, I low levelled the first IDE, so it had no partition, and then it worked. I got pissed off when the RH supplied Erratas crashed the system (everytime I tried) for no reason at all, and didn't think of trying it any more.
RH8 is still good for me.