Do a lot of reading, and if possible, try before you buy. There are a lot of Scandium .357 Mag j-frames that have never fired a full box of ammo (I bought three of them between 2004-2006).
Great concept, and nothing better for carry. Shooting them (esp. with "real" .357 Mag loads) is another story. Best description I ever read was something along the lines of finding a late 60s/early 70s full size GM car, placing your hand in the door frame, and slamming the door. And then doing it again.
Not so far from the truth. The first time is a shock...every time thereafter, you know what is coming...and do it anyway. Maybe. Very few do it on a regular basis. Of the three I bought (and sold), I know one guy who still has his. however...I honestly don't think he has fired it since shortly after buying it. How proficient can you be with a gun you never shoot (and dread practicing with)?
Most carry with .38 Spl or +p...so what you have (in essence) is a 442/642 that weighs an ounce or two less and costs twice as much.
These days I have a 638, and I am happy with that. If I found a 340/360 (or a pre-Lock 342) I'd grab it, but still only carry .38s.
As I say, do some reading on it.