I'm a controller at jax center and sometimes when another controller hands me an aircraft climbing everything looks fine, but then say it's a slow king air or even a crj. They are horrible performers in the climb by the way. We have to look at our traffic and sometime that aircraft isn't going to top an overflight and we have to stop the climber. The controller may have had to stop you because as soon as you checked on he was going to give you a vector to keep the climb going, but for whatever reason there wasn't time so you had to level. Remember we have to use 5 miles so you might not see the traffic we are keeping you away from. I have to agree with the previous post about the airlines checking on and stepping all over everyone. I am a pilot and have flown commercially and I always made sure to listen before talking. I appreciate those of you who do it! Thank you