The technology is interesting. Taser makes some really nice products but I think the cost quoted is inflated but at least Taser is "paying" for the test group in San Diego.
I am sure, with simple research, far cheaper alternatives can be found. Essentially these are personal video recorders. The effort should be made to reduce the amount of or the level of intrusiveness of equipment LEO's are already wearing. It may catch on for its benefits. I can't see an officer turning this on if something happens "too fast" so I am sure there will be missed moments but perhaps for most cases it will go alright.
Another area I think public safety should consider something like this is for their handguns. It would help solve A LOT of officer involved shooting or where an officer's gun was used, hell, I think a lot of people could stand to use it: The Burris Shotcam.
Interesting, they just need to work on increasing internal memory as well as battery life and reduce the size.
For this Taser cop-cam thing, I wonder who they are going to get to test it out. Perhaps the LEO's with the most complaints?