I have had a spool in my car for a long time. I had an auburn unit at one time that didn't last long at all so the spool was the next most reliable choice when I moved to 35 spline axles. My Jeep has a locker in it and while its better than a spool it is still a spool anytime your under throttle. It still chirps and barks the tires around corners and it can swap ends on you in the rain if your not careful when it goes from "open" to locked around a corner. The spool is really only annoying in parking lots and spaces that require tight turning, out on the road its a non issue.