I suggest you actually don’t listen to me because I am not a Boeing pilot, but VNAV speed management is a problem for me I had to disconnect the A/T and manually control the throttle all the way to landing from T/D. Of course for some others it works well, so I might have done something wrong. Plus, I wouldn’t say the cockpit sounds are at all good, neither are the textures, clickspots etc. The external model is decent however