They're very interesting pianos! They are incredibly refined, very high quality, and the equal of the best of Steinways. They're rather uncommon in the USA due to the virtual duopoly of Steinway and Yamaha in concert halls and conservatories, but you can certainly find them.
Personally I love some of the technical choices - on their larger grands, like the Imperial, there are extra keys on the low end. They're all black and not really meant to be played. Instead they provide extra resonance and a larger soundboard - though of course, if you want to hit that low G# in Ravel's Scarbo that doesn't actually exist on regular pianos, you can on a Bosendorfer.
As for your original question, I don't have an answer - car analogies don't hold very well for pianos.
Personally I love some of the technical choices - on their larger grands, like the Imperial, there are extra keys on the low end. They're all black and not really meant to be played. Instead they provide extra resonance and a larger soundboard - though of course, if you want to hit that low G# in Ravel's Scarbo that doesn't actually exist on regular pianos, you can on a Bosendorfer.
As for your original question, I don't have an answer - car analogies don't hold very well for pianos.