I only hunt Jagds. I own four and two catch dogs. I agree with most every description so far....like most breeds, each dog has its good and bad individual characteristics.
Only speaking from my experience.....
They tend to have a lot of grit and sometimes too much. Mine have excellent noses, very high hunting drive and uncompromisable heart. Depending what dogs I have on the ground...they are medium range. I think that mostly has to do with the trainers style of hunting.
They will consistantly hunt 500-800 yards but I also pick them up and move a lot....which I believe has made them a little closer range.
They will definitely test a hog and have no problem catching a 150 pig...but also seem to know there limits. It might take a lesson or two but they are also extremely intelligent.
Hunting with friends this past weekend we get to a bay and stick the pig. One Jagd lets go...throws his head up and leaves. I lose him on the Garmin at 2.5 miles. Bryant tells me that I have to leave get back on the highway, drive down to the community, take the FM road to get around the direction he is heading. We start driving while he is staying with the rest of the dogs. At 3 miles we get a bayed dog on the Garmin. Pick our way down county roads and then into a plowed field.
Luke has two 200 + lb hogs bayed together. Not sure how long but anywhere from 30-45 minutes. They can do most things a large dog can but come in a smaller package.

I will also agree that they love to swim but have the biggest disadvantage in water. since they have such a high prey drive...they can be difficult to trash break. Two of my four wont look at anything else, one can be talked into it and the fourth is a coon/armadillo hating fool.