When you say Rustic style as opposed to recreation do you mean in appearance type?
The problem is there are so many versions of that the original drives were in these dogs at least from what I have researched or in talking to people. To some there should be next to no prey drive as they were to guard and chasing everything that move might be counter productive to that, some say they should have equal amounts of each. Like I said just depends on who you are talking to and what they think the "original" job for the breed was.
The consensus at the moment seems to be that they were used for any and all jobs that were required which I would imagine would warrant all types of temperament, wouldn't you think?
Do I think the drives are what they used to be? No, not if you listen to the people that were the ones that were around when the breed first came over to the US or if they got to visit Italy (I am still a newbie in the breed, so would have to go with what I have heard unless I get to go to Italy and see the situation for myself) then the dogs we seen today are seriously watered down in comparison. Are there some that have harder lines more in the traditional sense I think so but I suspect like the Fila they are closely guarded and aren't for the faint of heart.
I have both a shorter muzzled and a correct length dogs here in our house but as I haven't worked either on a sleeve or as a catch dog I honestly can't answer that part of your question, you would have to check with someone that does, but there are strong arguments from both sides on being for an against the undershot. There have been heated debates by those that do use their dogs for hogs in regards to what is best but again I don't have that personal experience.
In everyday life do I notice much difference, no. They don't snore worse (my worse snorer is my level bite) I don't find them tiring any faster than the others unless it is due to heat as the shorter muzzled one is black but then again my formentino's aren't far behind in tiring from the heat. I would like to try them in some herding and see if there is a difference in regards to muzzle at that point and if I get a chance I will let you know.