The only problem I have discovered with the hot shoe flash adapter on the MG-s is that it only has an electrical connection on one side of the hot shoe. Since most LARGE hot shoe flashes have contacts on both sides of their shoes, it's not a problem for them, but I have yet to find a SMALL hot shoe flash that has the contact on the same side as the Minolta adapter. There are lots of them, but the connection is on the wrong side!
My solution is the Sunpak AUTO 121S (the 121C appears to be the same, but the plain 121 is larger). The 121S has a built-in short PC cord connection -- which folds away-- perfect for the MG-s flash adapter. The other good thing about the 121S is that it has manual & auto exposure settings -- unlike most SMALL flashes.
With the 121S you set the f-stop according to the film speed, and the exposure will be correct for up to 12 feet -- ISO 50 is f2.8,, ISO 100 is f4, ISO 400 is f8, etc.
Just a prefect combo. Uses two AA batteries.