A friend has been flying the 7X for a number of years now, and he despises the airplane. According to him, the 900EX was a better airplane from a flying and reliability standpoint. His favorite after nine corporate type ratings? The Gulfstream.
My son, who flies the 4 and 550, loves the Gulfstreams.
I haven't ever flown the 7X, but my impression, after hearing the stories, is that it is another case of too much college and not enough high school.