I've done part of it. From Perth to Adelaide, then switched to the Overland Adelaide-Melbourne.

From my POV, if it's a trip you wish to do, then do it, but I think it's a bit overpriced. Having said that, I wanted to do it, and am glad I did. I may even do it again one day, but all the way to Sydney (the Overland is a bit of a let down after the Indian Pacific).

I would also recommend first class sleeper (Gold Kangaroo) - the meals were excellent, and the sleeping cabins are bigger. As an example, I was in a single sleeper in gold Kangaroo (which is roughly the size of a broom closet, but big enough for one, and comfortable), In Red Kangaroo, the twin sleeper is the same size as the single sleeper in GK. And in RK, you buy the pre-prepared meals, GK meals are served in a very pleasant restaurant car, and included in ticket price (alcohol extra, natch)!

The GK singles had a toilet/washbasin, but showers at the end of trhe car. The doubles also included a shower. But I guess the website would tell you these things.

They offered a side bus trip ($16?) to a big opencut mine at Kalgoorlie, I didn't do this, but friends did, and were suitably impressed .I just walked the 500m or so, through dimly lit backstreets, to the main street, and found a couple of pubs.

Also stops at Cook, Adelaide, Broken Hill, and maybe Bathurst.

Enjoy your trip.