Other reviews have been dealing with this card well. I wanted to mention a few other things from my experience using it with Daisy Walker.

This is a strong card, but it feels like something that's only effective if you make it a core (if not the core) of your deck.

White Liger mentioned in a comment on another review that Abigail Foreman is strong with this card. With Research Notes attached to Abigail, you can double the number of clues you get from your success without any of the cost in evidence. This means you won't need a second copy of Research Notes.

If you're playing this, and need resources, you'll likely benefit from taking Crack the Case. You'll have a decent chance of taking advantage of a high shroud location multiple times.

Here is another card that involves resources. If you're running Research Notes, there is also a good chance you'll be running Research Librarian in order to find both of them (at least before you upgrade). Astounding Revelation will trigger when you use Research Librarian.

The Raven Quill is also convenient, since you can use it to find (or recover) your Research Notes and play it without an extra action, have it take up no slot (in case you want to include something else in your hand or other tomes). Being able to recover your Research Notes is particularly important if you're deck is built around it and you'd be out of luck without both copies.

There is a very nice interaction for this card someone commented at Carson Sinclair page , it is getting it back with Resourceful with far more control. Commenting only so this combo is also here for anyone who evaluates this card. 

I did a special challenge run, where I played Charlie and Preston,( called the 1/1/1/1 Run) and I ran Girish as a means to provide a boost and a soak. Charlie was the fighter and he did take a bunch of pain while Girish was in play. but I discovered a strange interaction with him and Bonnie. I could be fighting, and i could Exhaust him to trigger his heal on a successful test, but then I would Exhaust Bonnie, which allows me to ready Girish and Exhaust him again. this allows you to heal 2 damage/horror at a time, which is huge. Charlie really surprises me sometimes.

The single worst card to take to an Arkham event, esp if you don't know the people in your table.

Can you imagine crafting a wonderful standalone deck for an event that relies on one or two key cards, only for someone you've never met to draw this card to and nerf your deck?

This card is pretty scenario and player count dependent. Evidence on your own enemy can be hard to collect without getting attacked. You want treacheries that stay in play, or enemies not engaged with you. See this thread:

www.reddit.com