Gday
I still like the new 15" 7.5khz Coiltek coil
After just 12 hours use (all in turfed parks on shallow modern drops) I some early comments

and I would love any help and to discuss the points with other Xt WOT users and /or Coiltek
Pro's :It sure covers some turf in smart fashion ! which is why I got it as I am a slow coach
Light for size and lovely to swing...glides over the grass
Good pinpointing ( I use only the zig zag whilst pulling the coil back method)
Nice target pick out ability ...typical of DD coils single centre strip field of detection
Mine locks onto goldies and rings out loudly in no uncertain fashion
Handles a fairly fast swing with Sens at around 15 to 18
Con's :Makes the Xt nose heavy and un-balanced
( I put a small easily detachable counter weight behind my elbow into the shaft which works well to balance things out )
Unfortunately ...it hits hard and locks onto all sorts of bottle caps and tops ...sound is a very nice high tone just like silver but is trash.... the no's are the 40,42,44, 46 on Xt70/705
After digging countless beer tops, screwcaps etc I have disc'ed these out and so I will be now missing any .925 stuff
(I need to do some experimenting with some .925 silver and bottle tops to see if I can distinguish between trash and treasure)
Chattery with falsing when pushed over 20 Sens. (may be better in dry sand and low mineralisation)
So far so good ..money well spent and almost half way to paying itself off

cheers

NSC