This unit is outstanding for the price range. Right out of the box, it's easy to set up and use. The 2 focus adjusters are very easy to configure. ADJUST THE EYE PIECE FIRST until you have a full view (it will still be blurry, but don't worry, that's what the other adjuster will fix). Also, it works GREAT with my Mac and Windows 7 computers. In fact, when hooked up to a computer and using the fullscreen to navigate the stars (or whatever you use it for), you DO NOT, I repeat DO NOT have to adjust ANYTHING. It somehow auto-focuses and you don't need to do anything but move your tripod and record. BRILLIANT.
The unit works in the DAYtime and night with excellent results for each. The IR illuminator is UNNECESSARY/no effect unless you are in fairly close quarters. Battery life is also better than expected, but I often use the AC adapter.
STAR GAZERS/UFO HUNTERS*****This is the unit for you!!!! I can't say that enough.. WOW!
I have this thing aimed out my 8th floor apartment window on a tripod. I can see 4 stars with my naked eye (fairly large city), but with this unit I see THOUSANDS...Yes, thousands. No exaggeration. And let me tell you, there are things flying around our airspace that aren't conventional technology.
In conclusion, this is a sturdy, reliable (lifetime warranty), and professional night vision device. Like others have said, this IS NOT a toy. This is the real deal with amazing clarity and quality.
"Just shut up and give them your money" haha ki...