I had the chance to test a bit the 1266 and I have to say that I like it alot. It's a lucky detector as Dimas said
However, since our terrain is mostly rocky and bushy, at the end of the day I mostly dig with my T2 with the sniper coil.
Smaller coil does not get much stuck in the thorns and can search small areas difficult to reach. T2 is also sensibly lighter.
I have to say that I have the first generation of T2 with updated firmware, so it is very powerful but with the double D coil it was somehow over sensible. With the sniper coil the issue disappeared.