They keep coming up on my feed as well. I've never used them, but have used Apex Flavors (they are local and have found that a lot of breweries use them). Apex Flavors
I can attest that the Peanut butter (with chocolate or not) is very good. A plus is they sell in large and small volumes, making them great for the home brewer. Course, Amoretti may as well.......
Be aware that their craft "purees" are not anything like a normal puree (like Vintners Harvest, for example). If you look at the ingredients for the Raspberry, for example, the first four are water, cane sugar, dextrose, and fructose. None of these things are added to typical purees (which are usually just fruit).
I'm not saying they can't be useful, if you plan accordingly. Lots of people swear by them.
I would venture a guess these were made with cocktails in mind but they have expanded their market. I've seen people ask about them a lot but nobody taking the plunge to try them. I'm not sure I have a beer recipe calling out for a pumpkin pie "puree" that is sugar water with flavoring.