I got stuck with it because it was originally ordered as an option by the dealer for the car I bought. It's nice enough, but unnecessary in my opinion. There's already a built in space for it in the foam insert that holds the mobility kit, but it can't be put there if you put it in the case. I got rid of the insert as you can get a lot more stuff in that spot as was specified in this post.
http://www.myfocuselectric.com/forum/viewtopic.php?f=16&t=1936
In the end, I put my ClipperCreek LCS-25P in the bag and its in my i3. Unfortunately its not big enough to also hold the plug converter cords that I've built too. Personally, I'd skip it.