I had one a couple of years ago, rated it very highly to be honest but I PX'd it for a syndicate place as I had a set of Bins also. To be honest, I'd stick with the binos, rangefinding comes with practice.
Easiest way is to measure 100m, then pace it, I am 108 steps on flat ground, practice this when out walking anywhere. Look at a fixed point, (that's not 20m away, but upto what you think is about 250m), then pace it, after a relatively short time, you should get good at it and be generally within 20m, which for stalking will be more than accurate enough. Another method is to "Bracket", knowing that it's more than 70m but not as far as 100m, estimated 85m then, or, it's more than 120m but not 150m, estimated 135m, again, for stalking, more than accurate enough you can practice this and then pace to confirm.
TJ