I use the Bigfoot on the Prism V & it works well for the following reasons...
1) Pinpoints dead on (I use the tip of the coil), good for grass fields
2) Covers large areas quickly
3) Can get close to large metal objects such as chain link fences
4) Very light weight
Some disadvantages...
1) Does not go as deep as stock coils, have found objects to about 6 inches
2) Target ID seems to be off when using this coil
3) Since the coil is long, it is not as good as the stock coil on uneven ground