I have a prizm 5 but I would think that the pinpointing is the same. I have the larger open center coil, and it pinpoints nearly perfect right smack dab in the center of the coil.
Watch the display..I've found that it will indicate very deep targets that are relatively large with the 50 cent indicator and 2 inches deep. I found a metal piece at 15". Just kept digging and digging and I eventually found it.
A handheld pinpointer is really helpful too. I usually lift up the turf, scoop a little dirt out, then hand pinpoint and its usually pretty much right there.