Hi Kamak,
I got an Apricus evacuated tube system installed in 2011. 30 tubes, 315L glass lined tank, gas boost - Installed for around $5500 (after rebates).
I'm in Perth and have needed to turn on the boost 3-4 months of the year. Even then, my gas bills have been in the order of 2-3 units per day (I have no other gas requirements). My previous house had a gas storage system and used ~8 units per day during cooler months. 2 Adult, 2 small children household.
Overall, the system has performed well. I don't have prior experience with "normal" solar HW systems so can't provide a comparison. I've not had any issues with the Apricus system to date.
Hope that helps.
Sasquach