1. You can watch it from any computer but your account can be logged into only a single IP address at any time. This means that you are not able to easily share an account with someone since only one of you can be watching a game at a time.
2. It is cheaper to buy early.
3. In the U.S., you get every game that is not shown in the team's home market. Since you are in Australia, you get League Pass Broadband International which is a completely different client than the US domestic version and probably has different blackout rules. I think you would at least get every non-nationally broadcast game. Check the LeaguePass site for more details on that.
4. IIRC, pre-season games were included or maybe even free. I don't even remember.
5. Every game is archived an hour after it is shown so you can go back and watch it anytime during the season.
6. ^ See above. I have only gone back a couple days before on my part, but I think you can go back to watch any game of the season
7. No playoff games. Just regular season.
Again, my answers are based off of the US version of the service. Many things are different in the international version. However, they are different in nothing but positive ways from what I hear. Cheaper prices, higher quality stream, more/better features within the player itself, etc.