I have 6 male Robo's living in the same tank (dad and his sons) at the moment. Every evening I take them all out and play with them in a large plastic box. They run up and down my arm and even jump into my hand when I hold it a couple of inches above the ground.
Two daughters (we hope) are in another tank and are slightly less friendly, but still climb on my hand and arm after a few minutes in the box.
Mom used to be quite friendly, but is much more restrained since she had her litter taken away.
Every single one of them has bitten me. It has never hurt. They seem to think that callusses and dry bits of skin on your elbow are fair game...
I haven't got much experience of hamsters, but I have never seen any as entertaining to watch as these fellas! What do you get if you put 6 Robo's in a tank with 2 flying saucers? This;
http://www.youtube.com/watch?v=vLX2vQ-xbag