RE says that they weren't looking at a cc goal, but rather set forth specs for what they wanted the bike to do and they ended up at 410.
I was very sceptical of the size myself until I got to ride one for quite a while at the TX press launch. Mark Tuttle did do a good fair review. We are friends and those are his real thoughts. I was surprised at how stable the bike was in heavy winds for example. Much better than a C5. I was able to sneak away for a while by myself to see what it would do on the freeway. At 70 the bike was stable on the road and much more comfortable than a C5 at the same speed. I was able to get to 80-85 and stay there even in a wind. Not where I would want to cruise but the bike will do it.
Because it is a torque monster I didn't think a 6th speed was worth it.
My point is that it is a much better and well built bike than I expected. I would buy one in a minute. Once they get here do yourself a favor and test ride one. Only then will you know if it is or isn't for you.