Good and Bad
About 6 years ago the wife and I (and our 10-month-old son) went around Oz on those 45,000pt business class excursion thingies (do they still exist?). We booked Sydney-Cairns-Uluru-Broome-Perth-Sydney and then went looking for accommodation.
Most of it we could sort out, but Uluru was a problem until we called Qantas Holidays. They could get a much better rate than we could, so we booked with them. I had a similar experience a few years later when passing through Singapore - they could get a modest hotel with transfers and breakfast thrown in for a cheap rate.
But recently I was trying to use them to book the kids on matching flights to the UK. The first booking dropped out due to a misunderstanding, and when I tried to re-book early in the New Year, the price shot up by $1000. I then called Qantas direct, and even taking into account the $40 per ticket booking fee for a simple open-jawed fare and the $450 land content credit, it was almost $1000 cheaper to just buy airfares.
Still don't know why this was the case, but I am finding QH less and less useful (and expensive).
Cheers,
AC