It used to be fantastic. The killer app for me was that it was actually impressively good at searching text in images which at the time felt like magic. Like you could take a picture of a whiteboard or your handwritten notes from a meeting or slide on a screen at a conference and then do a free text search of the keywords in it a few months later and find it.

It was also really good at clipping web pages and helping you find them later. I really really liked it for free form research, like when you spend a couple weeks looking into a business idea to write up a detailed report later and want to find the reference to that concept or statistic you remember.

Ten years ago that kind of thing was really hard to do reliably and they were good at it.

But then instead of building on that success the product got worse. Oh well.