I've never used the Burris, but I have been playing with the VHR lately. So far, I like it:
Unfortunately when I thought to take a pic the mirages were pretty bad so that's the best I got. The target is at 205 yds and the scope is cranked down to about 8X or so.
I don't know about P-dogs, but I've found it pretty easy to match a couple different loads to each line on a "round number" when you consider +/- 1" or so is nothing to worry about for deer or elk. I also have had fun "holding into the wind" instead of clicking. Of course the marks won't be a perfect 10 for heavy high BC bullets (around 20-22 MPH depending upon the load) but the point is for a given load they're consistant. With a little practice one can do pretty well.
Ultimately I don't think they're going to be as precise as clicking, especially at really long ranges. But I think they will work quite well for bigger targets out to 5-600 yds or so.