I've been running their tires for a little while and just put a set on a friend's bike, as well.
On my bike, I went from a DHF 2.5WT/DHRII 2.3 rear to a Vigilante 2.5 Light/High Grip and Trail Boss 2.4 Light/Fast in the rear. As you said, it's a pretty significant weight increase over what I was running before, but I can't say that I notice any increase in effort or rolling resistance, in fact, I experienced the opposite. The combination is faster and grippier in every way, except straight line braking in the rear. The Vigilante corners a lot better, tracks better, and has a much less squared off profile. The Trail Boss is a faster rolling tread, but still manages to grip really well.
The only thing that worries me is the tire wear. I had a post a few months ago that indicated my Vigilante looked like it was starting to give it up at around 500 miles, but that wasn't the case. It looks exactly the same now as it did then, I even compared the knob height to a new one and it was only around 1/2mm off. So the Vigilante seems to wear fine. The Trail Boss, though, wore down it's center knobs after about 400 miles on the back or so. It still gripped reasonably well, but it was essentially a SS at that point and would drift more in corners.
I haven't ridden the Judge yet, I put one on a bike the other day, he likes it and says it works out great, but I expect it rolls pretty poorly given the tread.
Personally, I've added and removed inserts, along with heavy tires, I don't feel that the whole tire weight thing is that big of a difference. The tread seems to matter more than the rotational weight IMO, especially once you get moving.