Once you add the locker breather I don't know if it's worth it. I don't have a locker and have been really happy with the ARB kit so far, but now I'm set up for anything in the future as well.
I think it is a viable option for a trail rig if you have just one breather to worry about. I read through a bunch of threads on here and other sites. Some love the product and some show concerns with it on anything but a trail rig due to thei high temperatures created by long highway driving. Here is one such article.
trail gear creeper breather
If you're thinking about it just make sure you do the research and if you feel comfortable with it then go for it. I did hours and hours and that is why I settled in the ARB kit even though it was a more expensive option. It is what I felt best matched my needs, wants, and mechanical abilities.