Yup. I have a pair of MK5s. I thought the same thing at first. Too much sub. It's not. If blended correctly they sound awesome. I think, even at lower volumes because those big cones barely need to move to push the air needed for those frequencies.
They're top notch subs. Look up some reviews.
Here is a preview from Audioholics I found. I couldn't find their review, but I did find
this review on its little brother. I'm guessing my VTF-3 MK5s will have pretty much the same performance, but bigger, more powerful and just badass. I don't regret buying them.