Just got the 15" WOT for SOV-GT today and took it out to my test garden , i have a 5" dime ,6''and 7"and 8" and 9" dimes with sens at 2:30 i was able to get all the dimes to 8" with clear crisp beutifull sounds but the 9" was stuborn i had to tune it up a bit to get that 12:00 oclock and a bit more vigorus threshold and faster sweep but i got it . and in all metal its deeper yet 9" dime no problem a very diggable signal couldent check the 10" as a car was parked over it but it has a noticable better clarity on all coins i was suprized. and thanks to Demarco detector sales, fro the great price on this unit the coil is very high quality and very lite. Is it deeper than the stock 10" yes and this gives the clearer signals very clear and sharp pinponting is not a problem for me its the same as the 10