Locking differentials

[condor11]

I am contemplating installing a locking diff on my truck. The idea is to get it hooked up to an extra servo and lock it briefly only when road condition require it.

It appears there used to be a few 3-rd party brands that made them, but now there's only one from Lesu.

Has anyone actually used it? Did it work? Was it a direct fit in place of Tamiya, assuming I am keeping leaf springs and all the other stuff in place.

Looking for any and all feedback before I shell out hunderd bucks on it

Here's a picture of the subject