Re:
Yes it eats the back tires. Also makes it easier to slide the rear end on wet roads.
I've daily driven 2 Toyotas and a full size bronco with welded rears.
Just weld it, see if you can live with it. If not, swap an open carrier back in (which you can get for free or damn near).
Then you are only out a few bucks for rtv and oil.
If you change your driving style some ( slow down in the rain, no hard turns in parking lots, etc) it's not to bad.
I also put a Aussie locker in the back of the Toyota, it works OK, but also requires a driving style change (coasting around corners and such, since it will lock any time you get on the gas)