I've been testing this in Daisy Walker with good results. It acts as a second copy of her Tote Bag for consistency, with a few advantages:
- If I see this before the Tote Bag (I won't play both) then Tote Bag becomes basically a Guts or Perception without the card draw.
- It costs 1 more than Tote Bag, but it improves your action economy. It allows you to play something into a hand slot as an additional action, and then if it's a Tome Daisy can use her own ability to use its as an additional action.
- These extra hand slots don't have to hold Tomes, so you could play a Fingerprint Kit, Pocket Telescope, Scrying Mirror, The Chthonian Stone etc. (as examples) without spending a "real" action.