I have a couple of these:
http://www.bushnell.com/general/riflescopes_trophy_73-0135.cfm
You can buy here or maybe Aussie can get you a better deal:
http://www.swfa.com/pc-4969-198-bushnell-1x28-trophy-greenred-dot-sight.aspx
They're OK so long as you don't change the reticle after sighting in.
In other words, for close up stuff, change the reticle as much as you want, but for longer shots 50-75+ yards, changing the reticle can/will change your point of impact.
There are four different reticles to choose from:
1.) 3 MOA dot
2.) 10 MOA dot
3.) PLUS
4.) CIRCLE/DOT 65 MOA Circle (? I think ?) with 3 MOA (this is definite) dot inside circle.
There are several brightness setting per color RED/GREEN, I think 5 per color.
I've found the brightness of the RED in bright daylight more than enough, the GREEN is good at night or low light.
The different reticles are chosen by rotating a knob on the left hand side of the sight. This basically mechanically cams the different reticle patterns. Unfortunately, as you move the knob, you can see the position of the reticle move a bit in the sight, hence my warning about changing point of impact. For close in this won't have much of an impact on POI, but farther out, you bet it will.
I tend to prefer either the 3 MOA dot or the CIRCLE/DOT as the dot is 3 MOA in either case.
I'd say look through it, see which reticle pattern you like the best and stick with it. Then you don't have to worry about POI changes.
I haven't done any scientific testing of the changes in POI between the different reticle patterns, but I suspect it's at least a couple of MOA at 100 yards.
BTW - The rings are difficult to use, I don't like vertical split rings for some reason.