I currently own a Nikon 4.5-14X40 Buckmaster w/side focus. I think the scope is worth the money especially for hunting elk. If it is any consulation, I hit a 24"wide by 12" high piece of steel at 800yards. I could see the orange stickers of about 3" with no problem. I have been twiddling the turrets on this scope for alomost 2 years and always goes back to zero. Now for groundhogs at 1000, the reticle barries them. For an elk at 530 yards, you would be able to dial to its 12Xmil setting and be good to 600yards with the mil dots with a 200yrd zero. Or you could go for the 100yard zero and twiddle to your little hearts content. Not sure where the 3star rating comes from, but for the money and a tight shooting budget, the Nikon gets 5 stars and 2 thumbs up from this poor shooter (Married, 3 kids one is a budding teenager, you can guess where my money goes).
I also have a 6-18X40 Buckmaster with the target dot. Though I have just sent it away for repair, at 18 power and adjusting the turrets, I managed to hit a groundhog between the lookers at 605yards. At that distance and power, I could see its head very clearly. This scope is a little more expensive, but works very effectively and about $60 more.
At the top end of magnification, they are both very clear. In low light they get a little dark, but very effective none the less. I would highly recommend either scope. Just to follow up on my repair, when I called Nikon they showed genuine intrest in getting it back to me for my hunt in 3 weeks. So we will see how this works out. One guy who sells optics said he has heard very good things about their customer service. That would also be a bonus when considering and optic.
Tank