This product is amazing and one of my favorite takes on alchemy not just in Savage Worlds but in any RPG. Serrano and Sutcliffe have knocked it out of the park with this product. I think they've created an Arcane Background that is equally at home in a High Fantasy setting and a low or even no-magic campaign.
To give a quick overview of the system:
Herbalists gain access to 3 powers from a limited list and use the new "Herbalism" skill. The way this AB stands apart form other Arcane Backgrounds is in how it acquires Power Points each day. Every morning, they must make a skill check to gather ingredients, with the resulting roll providing a pool of PP that represents their haul. Most impressively, they can continue to build up their "supply of herbs and ingredients", or Power Points, before deciding to spend them crafting potions. This magic is the magic of flashy meteor showers or instant transformations. Each potion takes time to craft and has a hard limit on how much PP can be spent on a single potion.
Again, I can't overstate how much I love the ideas contained in this short PDF. It's inspired, and will appeal to those players that are looking for a character that brings a unique flavor and approach to the table. 5 out of 5 stars and I desperately hope this isn't the last product we see this dynamic duo create for Savage Worlds.