Be a man, run a locker. Just make sure your rear tire pressures are even or it might throw you around a bit.
If you are into S&M, self torture and mutilation a "Locker" is what you want.
These things are absolutely brutal on a street driven car and it is said that they were never run in NASCAR because if you for some inexplicable reason break an axle, you will spin the car.
I had one in my car for a week. There were several reasons it had to come out. First, I nearly got arrested because it spun the inside tire on a tight left hand turn in a Police directed emergency turn. The local PD can impound the car legal for "street racing" and take a very dim view of public displays of uncontrolled "acceleration".
I was only going like 5 mph, and this SOB spun the left rear tire, leaving rubber and squealing the whole way!
Next, I thought that I ran over a metal garbage can and broke the rear springs backing out of the garage. I don't need to induce additional paranoiac stresses.
Additionally, you will never get a passenger to ride in the car with you. They will jump out the window screaming that there is something wrong with this car (and obviously you too) and they don't want to die in a crate like that.
I've run the Ford traction-lok and it is much more then acceptable. It is true that it is not 100% efficient because it is a clutch unit and the left only gets about 50% of the power that it should but you couldn't prove that by me. The car lays down a very impressive set of skid marks and no one is going to do a scientific measurement of "power to the ground" measurements on them with the possible exception of the local PD as they prepare evidence against you for your day in court.
The True-track is probably going to be the smoothest and most civil unit you could run but with these cars, do you really want a civil pussy cat?