I have stayed at this hostel twice in the last couple of years. I completed by 2nd year work visa last year - ended up staying for 4 months. I have just been back and stayed for another 4 months. There is plenty of work available if you want it. There were plenty of people who had been in the hostel for several months. The owners can't control the weather and if farmers say they will start work on a specific day that also does not always happen. If you a realistic and patient you won't have any problem.
The $190 per week is a good rate - it's a lot cheaper than a lot of the other hostels in town. It's close to everything and includes transport, linen, air conditioning. They have Austar and free internet. The internet is slow - but I find it's slow all over Australia.
I travelling up the east coast now and then to Thailand but will be back in a couple of months to start work again up until Christmas.