Hey,
I picked up a Kogan 800m Rangefinder for $120 on special (from perhaps $185) with free shipping. I finally got the opportunity to use it down at the range. The optics are 6x25 with 7deg field of view. It seemed to measure the different target distances to within a couple of metres of what I expected. I think the spec sheet says tolerance error is the greater of +- 1m or +-0.1%. Some have rightly mentioned that the non illuminated eyepiece displays are difficult to read in lower light situations and I found this to be the case with the Kogan unit. The reading stays on the display for a second or so I found by looking at the sky or something brighter I could make a reading.
At this moment I'm extremely happy with the purchase. If it continues to work it should fulfill the need I had for it which was to help me learn to better estimate or judge distances.
I understand that it isn't a $5000 industrial measuing laser nor is it a $500 brand name shooting rangefinder so it met my $120 expectations
Sadly, last I looked they were sold out but if you don't need one immediately they may restock? I'd been watching them for a bit the were on and off sale a couple of times before I bought mine.
Goodluck!