Seekers traditionally have not gotten good accessories, especially at level 0. But don't cry for them. Instead of accessories they get very strong slotless assets like Pathfinder, Empirical Hypothesis, Fieldwork, and the like. Now that Hemlock Vale is out, Seekers ... still don't have a good level 0 accesory.
Chemistry set is a weird little jack of all trades of a card. It can theoretically generate a trickly of free draw for doing something you were going to do anyway, like a variant Lucky Cigarette Case or Empirical Hypothesis. It can theoretically be a clue accelerator like a baby Fingerprint Kit or re-usable Working a Hunch. It can theoretically generate resources over time, like a Dr. Milan Christopher or Thieves' Kit or Lone Wolf or something.
Trouble is, if you compare this to almost any dedicated single-function card, it's miles worse. You'd have to hit the resource gen three times to surpass the humble Emergency Cache, let alone Crack the Case or Rogue economy. You'd have to hit the draw 4 times to outdo Preposterous Sketches. If you want to compare it to draw assets, it gives you one chance per turn to draw if you suceed by exactly 2 when when hypo/cigs give you 3 chances per turn to succeed by 2/3 or more. You have the hit the succeed by 4 2-3 times before it beats Working a hunch, 4 times before it outdoes Fingerprint Kit (although of course it is cheaper to play).
Now, you might say that it's unfair to compare multi-function cards to specialized cards because versatility is a strength that you pay for. But I'm less certain that's true when you don't actually choose what benefits you get. You can't really rely on it to fix a hand size or resource economy problem and you can't stop it from giving you effects you don't need or want like forced draws on an already-full hand or "additional clues" when there was only 1 left in the first place.
So, let's suppose you play it, use it every turn for 6 turns, and trigger it half the time, hitting the benefits once each. You put in 2 resources, a card, and an action, and got back 2 resources, a card, and an additional clue. The net benefit after 6 turns, then, is that you spent an action to get an effectively testless clue. It's like a 0-cost working a hunch that drew a card instead of being fast. Only it's not really a free clue like with Working a Hunch, because you probably had to put some resources into oversuccess intentionally to hit that +4.
If you get it mid scenario, that's probably all you can expect to get from it. If you get it first thing, you can perhaps hope to hit each of its functions one more time. Which is indeed a pretty good return on investment, but nothing out of line with other early asset plays. And besides the up front cost to get it in play, it's also forcing you to take activate action on it which might block you out from using other tools or investigation events that are more effective. And it can blow itself up.
Not even Kate Winthrop really wants this, IMO.