You will definitely 'get what you pay for', so as long as you don't expect high-end iSUP performance it should be okay as a short-term learner board. It will likely be quite spongy & bouncy, and may not have as strong of a welded seam as the more expensive / higher quality brands.
That being said, I'm a big believer in saving to buy something that's going to suit your needs for longer. The initial outlay may be more, but it saves spending a few hundred on a lower quality SUP, then having to upgrade pretty quickly anyway, and you'll not get a lot on re-sale of the Adventure King.
You mentioned you're in Brisbane? Give Jason at SUP Centre Brisbane (BrisKites) a call - he stocks Naish, Starboard & Fanatic, and
might have some of their iSUP's in demo for you to try, or could give some more informed advice than myself.
Failing that, Red Paddle Co. pretty much lead the iSUP pack and are great quality, but they're a little more expensive.
enjoy the research on what you want, and more importantly, enjoy the paddling! See you on the water