I think I'm one of the few people who has used the Xtreme around here. I picked one of the 4-16x44 models with the doa 600 reticle up at my old job for kicks to try out because I got a great deal on it. The scope is decently made and the glass is between a leupold vx1 and vx3 in my opinion. The problem with the reticle is that it's only accurate for your drops at a specific power (for my dad's 223, the drops line up perfectly out to 500 yds at 13.5x with the 223 load we use, and the wind dots work for 3.5 and 7mph of wind). So you buy a variable power scope, but it basically ends up being a fixed power scope for shooting past 200 when you need to use the reticle. If you're shooting larger targets (I assume kangaroos are about deer sized) inside 450/500, the reticle is great for fast shots with no dialing needed. We've also used it quite successfully on prairie dogs inside 400. The problem is that for small targets past 400 on windy days, you end up really "floating" the target. Price wise, you must be paying quite the markup in australia, the Xtremes are around $200 here. I would personally recommend the 2.5-10 for your use, good FOV up close, and at 10x you should have no problem inside 400 shooting with the reticle. The store I worked at also sold the AR optics, which are very poorly built in my opinion, stay away. If you have any other questions, please ask.
