TLDR: Grab this early in Dunwich, grab this early in a group of 3+ players, otherwise stick with Shortcut until perhaps for the final scenario.

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Shortcut is a good card. Shortcut is also a good card. However, these two cards, have different functions.

Shortcut is this magic little boost that "burst" moves you around the map, It does not trigger opportunity attacks and not being an action can have nice interactions with specific cards and circumstances (for example to move an enemy around to play Scene of the Crime, get away from a massive enemy, get away after spending 3 actions to evade, ETC.). There is also a lot to be said about the added burst movement, having all 3 actions to attack/evade an enemy can be important.

Shortcut has all the same mechanics, but an added cost of 1 resource and 2 XP makes it a lot trickier to work into a deck, the cost is very prohibitive. First off, the biggest difference is that Shortcut is a persistent effect, so long as you keep entering the affected location you reap a benefit. In solo you need to play this card with finesse and find the location where you expect to pass by 2+ times, if you cannot then at least save it for that all-important moment where bonus movement is crucial. Its easier in multiplayer since the bonus moves will be used by your friends at least once, even in monodirectional maps like Essex County Express.

In fact Shortcut grows wings in any scenario that has locations you tend to move through routinely and every campaign has a couple such maps, but, I especially recommend Shortcut in Dunwich, 6 of its scenarios have at least one spot that will probably have you passing through 3+ times, sometimes passing through every single round for half the scenario. Also, final scenarios seem to have a way of making you run around a particular location a lot so give extra consideration to Shortcut before a final scenario.

Don't forget to consider your investigator's particular abilities, Roland Banks should never leave home without Shortcut and can give consideration to the upgrade (minimum one copy if you go for Stick to the Plan, which can host Shortcut), so should Ursula Downs, both of these characters really benefit from extra actions. Supporty Daisy Walker and Minh Thi Phan decks should also consider it.

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Although Shortcut has a LOT of power, compared to the un-upgraded version, the new -careful- way of playing it actually removes a lot of its charm, the spontaneous power is gone. The ability to capitalize opportunistically is still there, but now you must weight the opportunity up against ideal positioning and the added cost becomes a "Why did I bother to spend 2 XP on this?!" moment.

"Play only during your turn" (Investigation Phase) exists on both Shortcut and Shortcut (2). But this Shortcut (2) plays to attach, not to move. It then provide Move that is usable in any phase. I think the ability to fast Move outside of Investigation Phase is quite rare. (e.g. Pathfinder / Eon Chart has "during your turn".)

So you may find some niche use in Mythos Phase that you can suddenly move to change its difficulty. (e.g. Go to where your friends are to get commits, attempting to get Fieldwork boost, changing shroud that affects the test, alter skill card's value like Inquiring Mind / "Not without a fight!", etc.) Or some creative use in Enemy Phase by using the fast window after Hunter enemy moves but before it attacks (e.g. Get the engage and drag the enemy where your Guardian is, so they can respond with Dodge / Heroic Rescue / "Get behind me!" / True Grit, etc.) There is one window in Upkeep before readying the cards so you can still Move late if it turns out no one used it yet back in Investigation Phase.

So, remember how Pathfinder is a good card right?

What if I told you, that there was a version of pathfinder that was fast and could be used by your whole group?

Well, this card is as close as it gets and depending on the scenario and the player count it might JUST get you to that level of efficiency.

Add to this fact that Seekers typically have some extra experience to play with and I think this is an auto include in most seeker builds.

I find it quite interesting that the level 0 version of Shortcut does not count as a move action, but because of the bold action designator present on this level 2 version, a single use of it DOES count as a move action (albeit one you get to perform for free and without provoking attacks of opportunity thanks to it being a free triggered ability). There are scenario cards where this matters; any Forced ability that responds to an investigator using a "move action" will occur with this "upgraded" version, but it won't for the level 0 version. (A certain location in the first scenario for Path to Carcosa comes to mind.)

This card is awesome in Joe Diamond's hunch deck! It immediately saves you an action, and then another action every time you use it again. It wasn't hard for me to place it on commonly tread locations when I used it.