Generally, I would rate this card a bit weaker than Roland's .38 Special (at least until you have enough XP to be toting a Lightning Gun with some Extra Ammunition). That said, this card has great synergy with Roland's ability as it's fairly common, even with careful planning, to end up needing to kill an enemy on a location with no clues. Since this is a fast action, it doesn't provoke attacks of opportunity and can simply be thrown down right before the finishing attack, and not waste a Roland ability trigger on a clue-less location.
It also is the only investigator card to date that allows a clue from the token bank to be added to the total - this can be significant if the investigators end up 1 clue away from success and would otherwise need to travel to another location to obtain the last clue. The flexibility of being able to alternatively simply discover a clue as an effectively upgraded version of Working a Hunch ensures it isn't a dead draw on scenarios where you need to remove clues from a location rather than accumulate total clues (a common occurrence in the Carcosa cycle).
As a cute bonus, as an Insight it can be copied by other investigators who are using Eidetic Memory, though because it removes itself from the game it will be very difficult to actually use it very many more times by this method.
When playing Roland in an 8-scenario campaign, I'd always choose this card paired with The Dirge of Reason over the standard cards. Alternatively, since both this card and The Dirge of Reason have synergy with Roland's .38 Special AND with Cover Up, playing all four at once is also probably viable if you can tolerate the slight increase in deck size. Cover up is much less threatening if you pair it with cards that place clues on your location, since the real issue with Cover up is not so much the actions required to gather the clues as it is the possible lack of clues to gather, or the fact that they might be in distant or inaccessible spots. See also Dr. William T. Maleson and Forewarned for other cards whose clue-dropping can help Roland get rid of Cover Up.