I loved both SGI hardware and IRIX itself. There was a tremendous amount of effort put in to make it a desktop-friendly UNIX, and it showed. Services (NFS, networking, web services, etc.) were easy to configure using desktop apps, and the locations of system and user files was more intuitive than SunOS or NeXTSTEP.

SGI was my favourite UNIX until OS X, and I still have an SGI Fuel (with all the Nekochan extras) that I boot up each time I need a nostalgia kick:

https://triosdevelopers.com/jason.eckert/stuff/IRIX.png

https://triosdevelopers.com/jason.eckert/stuff/SGIFuel.jpg