Mustang knocking again Phil? you really have it in for this aircraft don't you.
Are you on sales commission with Cessna as the far as the CJ series is concerned.
Mustang is slower than other types but so far ATC have had no problems with it,if something faster is behind, they just move you to one side let it pass and let you back on your merry way,a lot of the time it's up at FL 370 and beyond and doesn't bother the airliners below.