We considered getting one and even went to see a one year old one with a view to buying him, but sadly he wasn't being kept very well and hadn't been socialised. They are lovely dogs with great temperaments, I guess the only downside is the grooming/hair shedding and the cost of purchase, plus the relatively low lifespan of giant breeds.
But they are certainly less extreme in features than lots of breeds and super dogs.
(we ended up with a rescue Doberman in the end!)
Just remembered the other thing that put me off is that there are guidelines re hip scores for breeding and altho the breeders all do the scores, some of them if the dog is well bred enough even if the scores were outside the acceptable guidelines, still seemed to use them for breeding (this was about 5 years ago tho), which I had a big issue with, the breed guidelines said they shouldn't be and then they still did and still won lots of cups etc, so look carefully at parents scores before choosing a pup. Most didn't do this at all, and it might not still happen.