My personal opinion on what I have found while using my range of X-Coils. More information can be found here: http://tolnix.com/gpz-7000-x-coils/
UPDATE 20-01-2022: With more use I have found the 10x15 elliptical DOD best when running threshold which improves target identification.
I then worked with the settings to get similar performance running Bogenes - which I prefer, but I would still recommend running threshold to get the most out of this coil. It is also nose sensitive much like the original Minelab 14 so pinpointing isn't hard. The 10X15 is a welcome addition to my X-coil collection with it's primary purpose for me being patch finding. As above, for best results - threshold "on" performed the best. Get yours now!
Also....opt for the poly-carbonate skid plate when buying - they are significantly better than the stock standard skid plate that comes included with the x-coils.
(This is not a paid promotion, I have personally invested over $6,000 in these coils and am happy with the results obtained.)