I've used Miwall ammo, I've actually got about 1500 rounds in the Garage right now. I haven't used it in .380 because I don't own one, but I've got it in .44mag, 357mag, and 9mm.
It's quality ammo, that's gone "bang" every time for me. My only complaint would be that it's a bit underpowered compared to factory rounds. I usually reload my ammo but due to some time restraints lately I picked some of this up to have on hand whenever, so I don't have a real problem with it as it is both rerliable and accurate.
For CCW purposes I would advise against it. If you are already carrying a low power weapon, you should use the best ammo you can afford for carry and obviously if you're carrying premium ammo, you need to train with it as well. Just for putting rounds downrange though the Miwall stuff is just fine.