There are a whole lot of people out there with opinions, and some of those opinions are valid while others are based on misunderstanding, anecdotes, and BS.
So whats up, doc? 45 colt for HD? So it beats out a 22lr, a 32 acp and a 50 A&E but does a 5 shot 45 colt revolver really beat out anything else?
Since a few people think that the anti-judge/governor people don't have their facts straight (lol) here is my list of criticisms of this type of revolver:
(these are NOT in a particular order, just off the top of my head)
1) capacity - ok so 5 shots is "enough" but if you have this gun, with 5, you could have instead a semi with say 10 or even more. I'd rather have more than 5, because you never know and your accuracy will be way lower in a SD scenario. Many studies state that 33% or 1 in 3 "hits" is the expectation. 1 shot of 5 is 20% so you may register one hit, in 5 rounds? (2 shots is 40% which is above average SD accuracy per any study or report on the subject). Will you reload the gun? Can you reload? Should you have to face this? Why ponder it when you could have a double stack auto?
2) Size - now of course, this doesn't come into play as much in a SD scenario, but once again, compare it to say a S&W J frame. What are you getting for the size? The power? I don't think its a good tradeoff. Everyone says "well its great 10 yds or less" so is a 9mm or a 38 special and countless other rounds. Every round should be good at that range. Many of the common pistol rounds are quite powerful at said ranges.
3) Accuracy - I can't think it would very accurate compared to other SD pistols or other pistols in general. Remember in a SD scenario you are much more likely to shoot the gun in DA. Of course you can get good with DA firing, but it takes a lot of time. Add in a shorter barrel length, and you have a gun that would not be too easy to shoot well with consistently. So you say to me "well it only needs to be accurate to 10 yds or less" and I say "well can't you shoot a 9mm or 38 10 yds or less on a man size target"? The other issue here is that your intent is not to wound the assailant but rather to maim or kill. I think a well placed shot with a 9mm or 38 hp (for example) is more deadly than the sloppy shooting that may happen because you are shooting a revolver with buckshot. Of course the buckshot is deadly if most of them land on target, but there you got less range.
4) Recoil - this is a prime consideration. So you may only place 1 in 3 shots in a SD encounter, which means a follow up shot is likely to be needed. How quick could you get one off? You think you could shoot quickly with 45 colt? Quick enough to save your life? Seems like an unnecessary gamble to me. Remember, "its effective out to say 10 yds" and so is a 45 acp (referring to semi here), 9mm, 38 special, 380, etc.
5) Weight - now of course, one must consider the lethality of 45 colt here and actually the lethality of buckshot WITHIN RANGE. The gun has to be bigger to offer the power of these chamberings, BUT, in these ranges, many guns are deadly. The weight dampens recoil, but if anyone wants to carry this, its not very light compared to other SD options. I know that the OP said he wants an exclusive HD gun, but many others think the Judge or Governor is a realistic CCW, and while it beats out a few other designs, its not a great one for that purpose. If the weight was the ONLY problem here, it wouldn't be very important, but its not.
6) Collateral damage - ever consider your buckshot going across the road and hitting someone or something else? You want to gamble on that? So the SD range is probably going to be inside say 30 ft, and you buy a judge/governor because you want to hit the attacker for sure. That makes sense BUT if you can't take most any handgun, and put your shots on a man size target consistently at 10 yds or less, then you should have a long arm, not a revolver which fires buckshot and not a handgun in general for that matter.
7) Which round to you actually ready the gun with? 45 colt / 45 acp has greater recoil, making for a slower follow up shot, and more power than what you need, BUT the 410 buckshot offers collateral damage risk while basically insuring some hits. So which one? Alternate them? Is that a good idea?
45 colt exclusive? Why not another type of gun, such as a DA S&W or Ruger, or etc. Surely many other 45 cal revolvers are more accurate. Buckshot exclusive? Why aren't you more confident in your accuracy? Why limit your range? (I mean this towards 2 legged creatures, not natural predators).
Honorable mention - buying such a gun from Taurus. I know this thread is about S&W, but many people buy a Judge, and trust their life to it. How much more proof do you need that this is a big gamble? Its a gamble of your life, no less. I think if someone is dead set on this type of revolver, I'd pay extra for the S&W although I have not read a ton about Judge quality control horror stories. Even so, Taurus earned their rep, and I care about my life more so than trusting a Taurus product, in general. (Exceptions can be made to this).
As said before, I don't think the Governor / Judge actually offers what people buy them for.