I just picked up a Taurus M66 6" blued .357, and have been fairly impressed with it so far.  It feels a lot like a K-Frame Smith, except the trigger isn't quite as good (yet).  I ordered a spring kit from Wolff, so hopefully that will help a bit.  Anyone had any experience with the Model 66?  The lock up is still very good on the gun, so I doubt it has seen many rounds.  Are they basically Taurus' copy of the Smith 19?