Well the brown truck delivered my Euro Pro with the 8" concentric coil today.---I checked it out & put it together then headed out to my large back yard to my test garden.---I re-done this (coin) test garden last Fall so its pretty new with the coins that's planted in it, also my ground is quite mineralized.------Anyway, the 8" concentric coil did "ok" on the shallower coins but when I put the 11" DD coil on, it turned that detector into a different animal (MUCH better depth for me).----I have one line of buried coins that consists of a buried Morgan silver dollar at 9"---Barber half at 7"---Barber quarter at 6+"---Barber dime at 6" & I.H. penny at 6 1/2".-------The 8" coil would only occasional "tick" on any of these coins no matter where I had the disc or sensitivity set.----When I put the 11" coil on the only coin in this line that it wouldn't hit was the Morgan $.--------BUT---when I put the 13" DD Ultimate coil on--it banged every one of them with room to spare, I could have easily went some deeper with that coil/combo.---It easily hit them with anything from 0 disc to 79 disc, didn't seem to matter & didn't loose any depth.---Also hit them with sensitivity down to 7 but below that depth suffered---10 sens. really hammered them.-------So anyone that's got the 13" Ultimate coil that you have been using on your Greek series or GB Pro/G2 detectors---it sure looks like that coil is going to be a good marriage on the Eurotek Pro also.-----I realize its a large coil & not for use just everywhere---but it SURE has its place.------That 8" coil is gonna set on the shelf, I'll be using the 11", 5 X 10 DD's & the 13 Ultimate coils on the Euro.---------Del