Installed about a month ago so some significant use but not all features yet.  I don't have a lot to compare to but compared to the stove it replaced it is much better.  Burners light without any issues and are very efficient in transmitting heat.  Boiling water takes about half the time as old stove.  Also, oven is very efficient and pre-heats in one third to one half the time as old oven.  Smaller dual ovens help with this but it is so much faster that it points to efficiency as well.