I voted "No."
Here is what Dr. Gary Roberts had to say about MagSafe:
Some additional reading:On 06 June 2002, we tested Magsafe .45 ACP “Defender” ammunition fired from a M1911 in both bare and 4 layer denim covered calibrated 10% ordnance gelatin. Very experienced military SOF personnel from units stationed at Fort Benning, Fort Bragg, and Fort Campbell were present, along with LE SWAT officers. The velocities averaged 1811 f/s. Terminal performance in both bare and denim covered gelatin was similar; the majority of tissue crush and stretch occurred in the first 4.1 inches of penetration, with the maximum pellet penetration ranging from 9 to 11 inches, however, the very small diameter shot used in the Magsafe load crushed correspondingly small permanent cavities. The Magsafe was deemed NOT acceptable by all the test participants. These results mirror the results by other agencies who have tested the Magsafe, including the FBI, CHP, and LAIR.
My recommendation would be to stick with conventional JHP's.