Not worth it. For that matter, anything under the Razor line I'd avoid like the plague. I personally have a 100% failure rate on their non-Razors, at least for anything purchased the past few years. This includes the Diamondback, Viper HS, and Viper HS LR lines.
Specifically to the Diamondback...
* Put a new Diamondback on a 6.5 CM. On the first shot one of the internal lenses came loose. Thought it was my contact lens so I took another shot. The internal lens moved more. Took another shot and the internal lens went horizontal. It is now collecting dust in the garage. Am too nice of a person to give/sell it to anyone.
* I do have an old (~5 years) Diamondback that was still going strong when I took if off (put a hand-me-down Razor LH on that rifle). I have another older Diamondback on a 223 that I use for predator hunting. It too is working fine.