Great gun in theory, but in practice it cant handle magnum loads and will break long before it should. Vicious recoil has a tendancy to engage the lock so anyone who intends to carry it for protection should disable the lock before it has a chance to kill you.
Bullet creep is a serious problem with cast loads, not so much with jacked ammo with a crimp on a canneluer. Did I mention vicious recoil?
Even with a set of the X-grips, its not a gun you take to the range for hundreds of rounds of practice.
I had one of the first 329PD's made by smith and it went back to the factory three times for problems with the lock engaging from recoil. The third time they kept it and Smith refunded my full purchase price including tax and shipping, so that right there has to tell you they know theres a problem.
I bought a 3" 629 with a full underlug and unfluted cylinder. With a set of X-grips, I can accurately shoot a cylinder full of 240gr JHP as fast as I can fire my 640 with 357 magnums.
The light weight is great, but not if you cant practice enough to become fast and accurate. Be careful with the 329, inspect it often and look for signs of wear and especially flame cutting...