Sometimes yea, sometimes nay!
I like the LCI extractor on my Glocks. I use it, and it doesn't change the aesthetics or add extra parts. It's in easy reach for a finger sweep without looking.
I don't like the LCI on my MkIII. I have never used it, and it adds 4 extra parts. A MkIII isn't the kind of gun I would ever keep loaded, anyway.
I like the LCI on my P64. It's right above the hammer. You can feel it with your thumb, which is automatic if you cock the hammer, manually.
I wish my Cougar HAD an LCI. Whenever I do a chamber check, the hammer goes to the halfcock notch. Then I have to use the clunky decocker.
Chamber checks are the only way to clear a gun. But to make sure a leprechaun didn't unload my HD gun while I wasn't looking, an LCI is good enough for me.
I like the Glock LCI best. You can sweep it from a shooting grip. You don't have to look at the gun. You don't even have to remove the gun from some holsters (if you're a righty, using something like a Serpa, for instance). And there's no extra parts. It's also very intuitive, being in the spot where you normally do a chamber check, anyway.
The best ambi LCI would have to be the kind that pops out the back of the slide, IMO.