I've had my pair of 10x fusions for over a year now and am happy with them...
I have ranged deer out to 7-800yrds no problem in good conditions.... Trees and buildings out to 1800
Only gripe I have is they have a greenish-blue tint to them and they aren't the best in low light conditions... One of the guys I hunt a bit with has a pair of Leica geovids that give him a good 15 extra minutes of usability at dusk and dawn..... But for the $850 I paid versus atleast double for the geovids I can't complain....
As far as for just ranging stuff the fusions hold their own against the geovids
Orch