I've got 29s both -2s and a -3, and I think they're both great. My -3 has very nice fit and finish, beautiful gun. There is some discussion on the durability of the -3s compared to the -2s. You'd have to shoot it a lot to see issues, and even then, it's an easy fix. The -2s can also get shot loose, the 44 mag is a powerful cartridge. S&W put out an enhancement that solved the issue with the -3s.
I really think the rap on the -3s is much a do about not a lot, and most of it stems from the -3 being the first m29 without the pinned/recessed treatment. Still a high quality, no MIM, no lock Smith. That said, you can get them for a little better price, so there is an up side...