what do you want to know about them?
I have sold a lot and used a lot, from very high end 10 grand +(military made one's for reading a few miles out)
to cheap one's!
there are a lot pf very good one's these days, , quality can vary, as you want accurate readings father out, as is there difference in the glass in them, and the magnification of them, , I personally find it harder to be very accurate at long distance when there is LOW power magnification on the range finder, too easy to be off a hair and get a WAY different reading.
MY most accurate range finder to date was a Swarovski LSR rifle scope I had back in the late 90's LOL
I have owned and played with a to since then, but is was so nice having a higher power optic with cross hairs to range things in the 700-1,000 yard range
there are many newer one's out now that read way farther, but again, I find them harder to stay on smaller targets and get readings
due to the lower magnification in them.
I DO like some of the binocular's with built in range finders, for the simple fact I can carry just one item over two, and again the higher magnification of them!, good one's are far from cheap however, but , it comes down to again, HOW far you are really looking to range things at!
so, maybe if you state more about what you wish to know, or what/how you plan to use one?/ can give you better feedback here?
I am sure many members here have them and can add to things as well, if we know more on what you wish to know about them!