Pragmatically, I think the main drawback with Arken will be that for what they cost, there's no way every example that gets out into the world is going to be perfect. But I don't think as consumers we can really expect them to have the same quality control that a company that's charging $2-3k for their scopes can (though plenty of those scopes still have to go back). As long as Arken keeps their promises in the warranty department, that is just a minor wrinkle that might have to be dealt with here and there as tradeoff for getting the performance they're offering for the price.
That said, as more scopes get out there, I predict the long range snobs of the world are going to be trying to shit all over them. There's no way a guy who paid $3000 for a piece of glass is going to give them a totally fair shake, those folks are always going to find a rationalization of why more expensive equates to being superior (especially after their money has already been spent).