I don't know the history as well as the folks at the Dan Wesson Fourms do, and I only know about the revolvers, but the general consensus on the modern models (14-2, 15-2, 7XX, 44, 22, Super Mags) is that the best made guns were made in the original Monson Massachusetts plant. These also seem to be more plentiful than the Palmer and Norwich guns, and mostly people say guns from the other two factories are still pretty good.
Most of the Dan Wesson guns are modular which means without a gunsmith, the owner can quickly switch out barrels and grips with just a couple of included tools. The barrel is theaded into the frame, then a metal barrel shroud slipped over it, then a barrel nut is secured at the muzzle end. The barrel is tensioned at both ends which is said to account for the legendary accuracy. All of the guts from one Dan Wesson 14-2 or 15-2 with the exception of the hand (I think) can be swapped into any other 14-2 or 15-2 with NO hand fitting (atleast that's how it's supposed to work).
CZ owns them now while they focus mostly on their mid-high end 1911s, they still periodically turn out a stainless model 715 here and there (I have seen 1 ever).
Prices are starting to get a little crazy on the guns, with barrel sets selling on gunbroker for $200-$400 depending on style and condition and guns going for $300-500. Much higher than current bluebook evaluation.