I'm very happy with my locked front end.... I baby it a bit, but it's also taken its fare share of abuse. I read the article previously mentioned, did an exhausting amount of research, and chose to go with the rd 90. It's got about 15k miles on it so far with a solid 1k off road( some pretty narly stuff, and i use it as my daily driver) . Works perfectly. (I also chose not to lock the rear end). As was mentioned in another post, you just use common sense, don't lock it and step on the gas when you know it's going to stress the set up. A locked front end will compensate for the fact that we (most 4runer owners), don't have the articulation and traction, of solid axel front end vehicles. I've yet to come to an obstacle that has it hasn't gotten over (except for the one time I got stuck in 2 feet of mud.... But then few vehicles wouldn't).