So for claritys sake - are we talking OS4 on Classic or OS4 on new PPC systems here?
As a new OS4 and X5000 user (I know, shocking)...I was completely confused here, am I supposed to:
1. Install OSFE Pre-Release and then AEON Enhancer etc. or
2. Install OSFE Pre-Release, Update 1, Update 2 (and HOTFIX) and then look at Enhancer 1.5?
...this seems messy and then
3. If I choose to install Enhancer 1.5, presumably I then go ahead and upgrade to the newly released 2.1

Right now I did #1 and system is OK but looks up occasionally when copying to RAM disk: - can be triggered easily by unarchiving, for example.