With wartime and post-war Lee-Enfields in VG+ condition selling for cheap, there's no need at all for an 'improved' new production Lee-Enfield. The only 'advantage' the AIA offers is a 7.62 NATO chambering, if you can call it that.
The AIA Enfields were made for a niche market in Australia, where semi-auto's are a no-no and where a fast cycling and familiar bolt-action in .308/7.62 is an advantage.
If the AIA Enfield sold as cheap as a regular Enfield, then I *might* buy one, but for $799 plus taxes and shipping, you can buy an original Enfield and a basic reloading set up that negates any savings you might encounter by using cheap 7.62 NATO ammo over commercial .303 ammo.