Well, I don't have any experience with Radions. I have a few friends who had them, and the amount of adjustability was quite impressive. Just about enough to drive them insane, trying to decide on the perfect settings.
Personally, if I had the Vortech pumps......I would go with radions. Kind of like Apple......if you are already in the eco system, you might as well stay there. I believe they make a good product.
However, if you don't have Vortechs, I think the Kessils are an amazing product. I have enjoyed great success with mine, and I have at least two original lights that are getting close to 4 years running at 100%. Mostly I have just replaced the ballasts, but a few burnt out, and Kessil quickly replaced them, free of charge.
If you already have an APEX, or some kind of controller that works with Kessil, then they are definitely a good option. I do think however, that they benefit from some supplemental lighting to help with shadowing and overall brightness.
If you have any specific questions about them, feel free to PM me.
Sounds like you are in for a good Christmas!! Congrats.
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