It's a good idea and better than FMJ. It's the issue ammo (.40 S&W) for Detroit PD they have had some issues with it in actual shooting incidents. I'd carry it if I couldn't carry JHPs. CorBon's PowRBall is another "non hollow point" that feeds, functions and expands with boring reliability.
I think Detroit PD has been lobbying to change to a different ammo from EFMJ. As has been mentioned it's reputation is less than sterling among those who have seen results of street use and those who have tested it in-lab. Go to www.tacticalforums.com and search the "The Terminal Effects Forum" for "EFMJ"
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