If anyone is considering travelling to Australia with Xtreme Gap my advice is do it! I had the 1st 5 months of my life travelling up the east coast from Sydney to Cairns.
I opted to choose a gap year company because I was travelling on my own, and this company struck me as the most fun. In all it was pretty good value, I saw quite a few shorter tours which were around the same price, so I was a bit sceptical as to whether the package would deliver on my expectations.
Sarah at Xtreme Gap Year was very helpful with answering all my questions before I went away, and I had quite a few of them! She came up with some great suggestions for things for me to do whilst I was away. As for meeting people, I found this pretty easy to do once travelling. The structure of the trip was such that you are constantly meeting new people, and there was a great mix of different adventures as well. I got to snorkel on the Great Barrier Reef, go skydiving but my personal favourite was Fraser island. I was paired up with a group of 6 people in a Land Rover, and got to spend a couple of days camping out under the most amazing stars.
I can understand how this trip wouldn't be for everyone however, because it's flexible you have to set the dates for when you want to do the activities, but actually I found this super easy. Everywhere you stay you can do this in person or via email or telephone. So for me this wasn't an issue, and was a small price to pay for the savings I made compared to more expensive two-week fully guided tours.