I have a 7-shot L-frame that I had TK Custom modify for their Moonclips. I specified Star-line brass and the rounds fit fine in the Moonclips I bought at the time I had the cylinder modified.
The only speed loader available for the 7-shot L-frame is the HKS. It requires loading with the right hand while the left holds the cylinder to keep it from rotating. I have 40 years of loading with the left hand ingrained, starting when I shot PPC with a bull-gun in '76-'77 and used Date Screw Machine loaders. Later in shooting practical pistol competition I either used Safariland, again with the left hand, or full moon clips in M-25s and 625s.
Because of the above it was worth it to me to be able to use Moonclips in the 7-shot S&W. With the proper tools they are no harder to load than hi-cap magazines that need loaders to top them off. And the advantages are numerous.
If you are a casual range shooter the Moonclips are probably not worth the bother. If you plan to carry the revolver for self-defense (as I intend to do) then they are indeed worth all the "bother".
Choose wisely,
Dave