I've had a 651 (shrouded hammer) for a little over 2 years now. Between range time and dry firing with snap caps, its action has become very smooth. It was relatively inexpensive, about $350 out the door, and I have not had any problems with it when shooting.
I will usually fire about 30 .38 +ps, 20 or 25 Blazer .357 magnums (a fairly mild magnum load), and no more than 10 full power .357 rounds (currently Federal 130 gr. HydraShocks) through it in a single range session.
The satin(?) stainless finish on the gun is holding up very well and makes for a very easy to clean gun that does not stand out too much.
I am very happy with mine and the other 2 revolvers and 3 semi-autos from Taurus that I own.
Dave