I can't use Update 1. It will NOT work (I tried few tricks).
I assume that on A3000 with SCSI works way better then on m A1200 with stock IDE controller (since FastATA that I have and should be supported it NOT supported! - I can't use CD-ROM and HDD at the same time).
So, my AmigaOS4.1 on classic is super slow (read/write). CPU is quite OK for most stuff. It works OKish, looks very nice etc. etc. but I don't consider this as a "final" edition, more like advanced beta. It was cheap (if you have PPC!!!) so no complains here.
I also wish that AmigaOS4.1 would have native access to most other hardware on my Amiga 1200. Then it would be my main OS "forever", but at this point is more a as "I can do it, so I did it".