The few times I've played Vayne on Dominion I picked up an early Lightbringer as an early attack speed/AD item (basically following Sauron's guide because I am terrible at Dominion itemization), but I picked it up as an AS/AD item, not as a "reveal stealth champions" item. As I recall, there was a Shaco in one game, but it literally never helped me fight him; if he was backdooring and I came to shove him off, he'd just Deceive away before I could land that first autoattack, and after that the only way I could reveal him is if he was ALREADY visible.
I guess I kind of question the logic of an item that reveals stealth champions that is contingent on being able to target them with an autoattack, which by definition doesn't work on stealthed champions. Because of that, the Lightbringer ends up being less of a "situational item to reveal stealth champions" and more of an "item that disables a very short list of abilities, counterpicking a nearly-random selection of champions".
Wukong, Akali, and Vayne, who primarily use their stealths defensively are weakened/neutered by this item, while champions who use their stealths aggressively (Rengar, Twitch) are essentially unaffected. Talon, similarly, rarely uses his ult for a purely defensive mechanism in a situation in which the Lightbringer would change the result (due to his movespeed during the stealth).
Teemo and Eve are literally unable to stealth while under fire, making the item meaningless against them (note that the other stealth concern with Teemo, which is 'revealing mushrooms' is impossible with the lightbringer).
Finally, intentionally or not, Kha'zix basically loses the use of his ult almost entirely when under Lightbringer fire; unless it's Evolved, he gains nothing by using his ult but 40% movespeed for one second (twice). I feel like that's a bit of a harsh penalty considering that it's quite difficult to close to melee range as Kha'zix without taking a stray Lightbringer autoattack.
Not to say the item's overpowered, just that the idea of a "stealth counter item for autoattackers" seems to have been poorly executed with the Lightbringer. The fact that such a heavy attack speed focus is not useful for many AD champions makes it awkward to buy. For example, if one is playing Riven, Lightbringer feels like an awful buy because she makes such poor use of attack speed, but the only alternative for counterbuilding stealth would be a Hextech Sweeper.
Edit: I suppose the correct phrasing should be "for permanently counterbuilding", since an Oracle's Extract will provide a stopgap solution for stealth champions.
Edit 2: Worth noting is the fact that the other primary use for the Lightbringer (other than revealing stealth champions) is for preventing brush jukes and turning a retreat into a bushwack (because the enemy has an ally in the bush). That's... technically valuable, but it's once again dependent on landing an autoattack on the retreating enemy first, and on the whole seems more like an unintentional result than a design choice. It gives a champion like Vayne no more ability to check bushes safely than she had before unless a helpful enemy enters the bush after being shot.