Did some development for a server application that supported RS/6000 among other platforms. AIX on RS/6000 was a nice enough Unix but, being used to Solaris, everything seems just slightly off. I think it performed slightly worse for the same price as Sparc hardware for our purposes, but some customers wanted an all IBM solution (we also supported an OS/2 client).
The main thing that stands out was a tool (smitty?) that could do system configuration and IIRC it could show you the steps to do it manually as well.
The main thing that stands out was a tool (smitty?) that could do system configuration and IIRC it could show you the steps to do it manually as well.