Been on the 60 a couple of years and its a great plane, mind you, its all Ive flown so Im biased and unable to comment on other types! It climbs like a rocket, FL410 in 14 mins at MTOM, approx 0.78 cruise etc but its downsides are the wing and brakes which mean high approach speeds and long required landing distances. Avionics are great, nose wheel steering has been known to cause grief and the APU can give occasional problems. The GPU hole/socket can also give probs with european GPU sockets unable to fit without some serious pushing or taking apart. Luggage space is sufficiant, once you get used to how to get large suitcases into small holes and the galley has everything you need. Im sure one of the Netjet guys can give you the heads up on the 400.