[gentoo-user] Is anyone using a TALOS 2 or any OpenPOWER machine?

I am of curious as to peoples experiences with OpenPOWER machines and 
gentoo - is it as simple as using the ppc64 arch iso instead of x86_64?
If anyone uses it for a workstation, what apps do you have? is there 
anything normal missing? (ie: that one would have on an x86_64 workstation)

I noticed that gentoo only has big endian isos instead of little endian 
and I am also wondering what this means for software availability as I 
have never heard of endianness before a few months ago.

Info:
https://en.wikipedia.org/wiki/POWER9 (POWER is now the only high 
performance arch that is owner controlled now that AMD has its ME analog 
PSP)
http://raptorcs.com/ (The T2 is a modified "romulus" reference board 
made available to the general public with libre firmware)