I'll just give you my personal feeling on them and let you decide from there. I had them on my 89 when I bought it. Everyone told me that you never really knew when they were engaged and when they weren't. They always seemed to work fine for me. I was heading to work one morning down the turnpike when they locked, at 80mph. The shock that that gave my entire truck almost ended the truck and me. It blew every u-joint, bearing, and seal in my truck and sent my sliding meadium out of control.
Bad deal. I know times are tough and money is tight, but I'd not go anywhere before I had to run auto's again.
My $0.02