They don't look anything alike.
Here's the Bridgestone H/T 840 supplied on 4Runner SR5 and Limited and GX470...
http://www.tirerack.com/tires/tires.jsp?tireMake=Bridgestone&tireModel=Dueler+H/T+D840
then read the reviews...about 80% hate the H/T...and they are alomsot to a "T" (pun intended) all Toyota owners driving Sequoias, 4Runners, Tundras, etc.
now go see the Revos...
http://www.tirerack.com/tires/tires.jsp?tireMake=Bridgestone&tireModel=Dueler+A/T+Revo
and read the reviews on that...
to be fair, I have 16,000 on the H/T and I am a fairly conservative driver. Fair in rain and that is because I drive carefully knowing that it tends to slip and slide. So far, no slipping and sliding when driving with care. Pattern on the H/T does not have good water evacuation routes to push out water as the tire rolls.
Decent on dry. But the tread is pretty thin to begin with and not very thick. Not very agressive for anything but light dirt roads. Have not gone 4 wheeling yet, but I don't do 4 wheeling.
I used to drive out in my Tahoe 4x4 to explore old mining towns--Garlock, Randsburg, Burro Schmidt's Tunnel; Indian reservations and the great outdoors like Monument Valley, Chinle, Kayenta, Pueblo Bonita, old trails in the Mojave Desert, etc. so I do travel on dirt, gravel, some mud, and trails.
Not driven on snow yet though I don't see much treat pattern for good snow traction.
I just don't have confidence that the H/T could be there when I get back to exploring again. I don't have confidence that it could do well in loose soil, slight mud, winter conditions when caught in a snow storm, rain donwpour, slop through run off channels, blistering heat on the desert or freezing cold in the winter, or shapr rocks nad gravel. The H/T tread does not protect the edges well and allows the sidal to be exposed where the BFG and the Revos have a fairly stout tread going edge to edge.
I have the Toyo Open COuntry A/T Load D on my Tahoe and the tread is thick with wide channels to flush out water adn thick edges to protect the sidewalls where it meets the tread.
Conclusion: the H/T are MEDIOCRE. It's Like Oklahoma, it's OK, not great, not wonderful, nothing to braga about, nothing I would spend good money on, it's OK.
As soon as I wear the H/T out, it's BFG or Revo, or Toyo.