I just got my Spartan installed over the weekend and I have to say I was a little bit surprised with some of the clanking and banging. It doesn't do it all the time, but especially making u-turns up a parking garage it doesn't always smoothly unlock and ratchet. It will either say locked and chirp a tire or will kinda bind and bang unlocked about every other turn. That combined with the firestik hitting the ceiling scares the hell out of people walking by
That being said, it does seem to do fine just making normal 90* turns. Fairly seemless, just the occasional little thunk that lets you know its there.
P.S. The install is a breeze even for someone who has never worked on the axle before. The included instructions were extremely helpful with pictures and descriptions. Had it done, including an hour long parts run for an axle seal in about 4 and a half or 5 hours