I have two 12 string guitars, a Tanglewood and a Martin.

I have to say the Tanglewood is far a away a better guitar.

The action on the Martin is appalling, it's just gone off to a new Luthier for the third time in as many years to be adjusted.

(I am dubious about the other Luthier who "fixed" it twice.

I have had the Tanglewood in DADGAD tuning for the past 6 months and the sound in brilliant.