I suppose my view is tarnished by my EZ4 which uses the same method, and EZ4 saves are crap in comparison, I have lost at least 4 or maybe 5 saves with it in the last month.
I'm looking to get an M3-Lite for the new DS-Lite in the household soon (as long as the price isn't silly), and would rather see it use the SC save system. I thought all 3 main carts will keep us covered. I still think it would be nice for a direct save sytem as I totally don't like the EZ4 method (when you boot a gba game on EZ4 the previous DS save takes around 30 seconds to write to mem card! ... if lucky )