I have a 442 Pro that I purchased a year or so ago. As far as trigger pull "out of the box" goes, I don't think there was much, if any difference between that and my 642-1.
The Pro does not come with the dreaded lock if that is a concern for you.
Regarding moon clips, they are not needed to shoot the gun. Unclipped .38s will load, fire and eject just fine. The advantage to the moon clip is in speed of reloading, or perhaps more accurately speed of unloading. A clip of empty cases will, for me at least, reduce the chance of getting one case jammed against the left grip or lodged under the ejector star during an attempt at speedy reloading.
When I carry my 442, the load in the cylinder is clipped, with a speed strip for a reload if needed.
The downside with clips for .38/.357 is that unlike .45 ACP, one size does not fit all. Depending on the brand of ammo you decide on, you may need a different size (thickness) moon clip. The ones provided with the gun do work with Speer, Remington and Winchester cases. I believe TK Custom makes clips in various thicknesses if needed. .38/.357 clips are also more expensive than the common .45 variety.
The Pros are great guns, I think that you would like it. As I don't know how much of a premium your LGS is charging I can't comment on whether it is "worth it"over the price of a standard model.