I don’t own those but I have looked at them/ handled them. Ergonomics are good, range finder was accurate to a couple hundred yards compared to other range finders. Didn’t have enough distance to test them out farther. Vortex claims the glass is comparable to the Viper series. I have a pair of Viper HDs and I would agree compared to the Razors the edges aren’t as clear. This was my one gripe, if the company was going this route why not go with the Razor quality optics. The only thing I can come up with is they wanted to find a middle ground niche for these and not try to compete with Swaro, Leica or even Nikon EDG on a price point basis. All in all I’m going to got with Razors and the Ranger 1800. That being said I have no complaints with the company and operation of the unit. They seem solid and if your in the market a combo set up these won’t break the bank.