In front of my rig, I've run a TrueTrac, a Lockrite and now an ARB.
With the Truetrac, my take on it was that it was better than nothing, probably better than most limited slips, but I always felt like it was never engaging when I wanted it to and it was when I didn't. For example, when I was stuck in snow, I could never seem to get it to work, but when I was driving on ice, I might as well have spools front and rear, which was pretty dangerous. Sent to me to the ditch one time.
I like to drive around with the hubs locked in 4WD on gravel roads for safety reasons. The steering was heavier and noticable, but not bad.
With the Lockrite, it literally was spools front and rear most of the time and I didn't even attempt to drive in ice and snow. I absolutely hated how it drove in 4WD. The steering was very heavy and unpredictable. After almost driving off a cliff, because I couldn't get the steering to turn fast enough, I said screw it and went with an ARB.
It was spendy as heck and yes, I hardly use it, but I haven't looked back since. I wish I would have done it in the first place. I wouldn't go any other way up front, except if an ARB wasn't in my budget, I'd probably leave the front open and stock.