I'm assuming he is using PLA rather than ABS. Two things that help with PLA:

1. Make sure to clean the bed with acetone or ethanol before applying the tape. After applying the tape, clean the tape rigorously with acetone or ethanol. This will make sure that any oil from your hands, etc., is removed.
2. Make sure that your bed is level to your nozzle and that your starting nozzle height is correct. You should barely be able to get a piece of paper between your nozzle and bed when your z-axis is homed.

I find that I have trouble getting the part off the tape when I've done this correctly.

Cheers,

KDog