We have never been bitten by ours, and wouldn't want to be. A bite from one of these lizards can even require stitches. Not trying to scare anyone off, just giving you information that you should know before purchasing a monitor lizard. We also believe that a Savannah monitor is one of the best monitor lizards to start with. They are well-known for becoming tame in captivity, especially if you are willing to invest time into taming them.
Some Savannahs almost seem to be affectionate towards their owners.
Captive raised animals are the best choice, but since monitors don't breed easily in captivity, it is likely that you will end up purchasing an imported lizard. Usually young monitors will squirm around alot when first handled, and sometimes they will defecate. This is normal, and it should pass with frequent handling. The monitor you purchase should also be fairly clean around the vent and belly, not caked with feces. This may take a couple of weeks or so, depending on the lizard that you have selected.