Ah... the ol "should I lock the 35 question." I know everyone bashes the D35 because of some people's personal experience but mostly because of what they have heard or read. But in truth it all depends on how you drive both offroad and on. I upgraded my D35 with a Superior axle and Detroit locker because its what I had to work with. But I did a fair amount of wheeling for several years on just the factory axles. Again I didn't drive it like it was a rental car (and still don't)
My jeep is my daily driver so until I can keep it in my shop and make it a project rig the stock axles were my best bet. I would like to eventually upgrade both front and rear axles down the road but that will be many years from now. In the mean time I can wheel it just as hard as the next guy and not have to worry about the axles. What a lot of people don't realize is that for every part you strengthen you just weaken another part down the line. And I can always sell my axles to one of my many jeepin' buddies down the road when I go to upgrade and put that money towards my new axles.
I have added and sold many parts from my jeep over the years and one thing I have found out is someone is always in need of good used parts. Will you get all of your money back out of them that you spent? Probably not, but at least you can get your money out of them by using them. So if your not into hardcore wheeling and it is your daily driver I would just do what your budget allows. Sorry about the rant but that's my .02
03' Freedom edition, 4.0, 5 speed, 4" zone lift, D30, Superior D35 with detroit locker, 4:56 gears, 33x12.5 bigfoot xt, 15x8 eagle alloys
God created all men equal, then a few of us became firefighters