The chromes outperform their predecessors but as far as comparing to the V2, who knows. I imagine the V2's are better than originals (V1), as the individual LED's are further spaced apart from one another, allowing greater spread, and also have their own holes/housing to better direct and reflect light. The only downside that I noticed was that they didn't offer a UVA 385 nm nor a Infrared 730 nm chip with this model, which they had done so in the past with the V1. I'm a little disappointed about that but they claim it's included with the 12,000k white LEDs.
Check out the Ion-8, I've been told that it does wonderful things during flowering.
My guess: V1 <= V2 < Chrome <= Ion-8