Received both my Garrett SeaHunter coils back after being calibrated for my Crossbow Pulse machine and have to admit it was well worth buying them,the stock 10.5inch coil is a good all round coil but its handy if you have additional coils as well,both the 14X10 Mono and 8inch Mono work very well,the smaller one is very sensitive to our small silver hammered coins,we have one roman villa site that in my mind is the hardest field too detect due to being highly mineralized infact the sand which is about 70 miles inland is nearly black its that bad.But using a PI and the Mono coils should be a very good combination.
Will be out this weekend and give both new coils a good workout and will update on how they perform.