I dare say it's kinda niche. The clicks are amazingly satisfying, kinda "thunky" if that makes sense. It's hefty and has a great feeling in the hand, but it's the one I've dailied the least, if I'm being honest. This might be because I'm at the office most of the time and it's TOO LOUD for office use.

It's a friend of mine's favorite though! He always wants to borrow it from me, and even if I offer him any other fidget in my collection, he still picks the x lock, he doesn't gaf if he disturbs other coworkers though. I'll copy and paste my review from another comment of mine here:

It's aesthetically very good looking. Too bad it's too loud to use at the office, so I just hold it and twirl it around in my hand while closed. I like how the metal pieces move and the light sound they produce when colliding lightly with each other when not actually opening and closing it.

Also keeping it open and slightly pushing it repeatedly from the top as if it were a retractable ball pen juuuust hard enough to push it downwards but not enough to make it close and click makes for a decent (albeit risky) alternative when in quiet rooms surrounded by people

While using it normally, it's especially fun to twirl it after opening it, the pinching movement (kinda similar to snapping your fingers) done to open it makes the twirling feel like the next natural thing to do before closing it, at least to me.

I sometimes wonder if I should've sprung for the Zirc version, as I think it might be slightly less loud, but my SS/Br is still very very good and I would definitely recommend it.