Single action revolvers are fine for defense against bears and other critters, but I wouldn't choose one for a combat situation.
That being said, I own two Super Blackhawks, and I love them.
Beat me to it. I have a Blackhawk in .41 mag that's my bear season carry piece (and that's NOW) but I wouldn't want to depend on reloading it in a tight-sphincter combat situation. Might just as well throw the ammo at the bad guys and hope to put their eye out.