Low end?
So, I'm far from an authority on what constitutes what, but here is an explanation of how I'm defining things. I would put the Razor level in the upper mid range. Cannot afford to try everything, and at that price point there is a lot I would like to try. Viper HD would be lower mid range and are the price point where I would personally start considering Vortex. At the Diamondback level I would most likely get Vortex.
Anyway, at this point I'm just responding to the question mark and not really contributing to a productive discussion. I just wanted to be clear that I don't consider Vortex a low end company.