I've had this great grill for about 3 years now.... works perfect!  WAY better than a cheaper imitation grill.  The one thing that was bugging me about it is that I couldn't keep the coals super hot.... now I know to open both vents all the way... and if it is still not enough heat or the heat is dying... just take off the top and it will get super hot with an open top air flow!  Hope this helps someone.