I service them and use them at work every single day. I dunno what you are comparing them to but they are very well built. The cine 30's are even nicer and have a really cool quick release plate locking mechanism.
My only suggestion is common sense but you would be surprised at how many people bring that the equipment like this: when transporting it, leave the head at a level position. NEVER lock it while facing up and down to "save space" or because of laziness. You will tear up the spring mechanisms in it quicker than a fart on a oil slick.