I have an Aussie Locker in my Dana 30 in the front of my TJ. (Aussie is now US based and won't ship to Australia - I bought it in the US. I think Lokka is the same and available here). I think it is great. Never heard it. Never had any issues with steering. Seems to work well. I've never used any other type of locker, so I don't have any other experience to compare to, but my experience with this one has been all good.
Greg