I have the 3200.com, I really like them. Good glass, they work with AB. Them pairing with AB was a requirement for me. I think the sig BDX range finder function is as good, glass however is not. I could glass for hours in the mountains and my eyes felt no fatigue. I have not looked at the new vortex line that pairs with AB. At this point in time I have no reason to. I had a problem with the 3200s connecting with 5700, I got in touch with customer service. They had me lined out in no time. I needed an update, it was simple.
If money was an issue I would look hard at the vortex line. I am not going to say the 3200s are 2k better than the sigs and 1.5k better then the vortex line. It really depends on what matters most at the time to you. All 3 will range further than most people and equipment are able to shoot. I was ranging cliffs at 3753 yards. That was the limit I found in those conditions, bright sun, in Colorado in October.
The only other range finder that I know will range further is a vectronix they are BA but if you think these manufactures mentioned in the thread are bad haha you do want to try these guys out.