We are recently on the 7 and 7 and it's been working good. I've actually been getting home a day early since we started about 6 weeks ago. The company is good and still growing with all the associated growing pains. It's way better than it used to be but if you have a low threshold for frustration (mine varies greatly) then I would recommend CS because they are more established. IF you can roll w/punches then this might be better for you due to what I believe is an earlier upgrade. I don't know what CS's are, but Avantair is still getting a plane a month for approx 3 years, and in 2009 or so the 20 some phenom 100's are supposed to start arriving in addition to the piaggio's