Have been using Tier 1 for several months. This is an excellent tool for multiformat document analysis, both single and multiple documents. I've been primarily using to analyze large PDFs (some are 1000+ pages) and batches of PDF with lower page counts. You've a choice between 3 different AI models (ChatGPT 3.5, Claude 3 Haiku, Gemini Flash 1.5) depending on the sort of analysis and outputs you're wanting to generate; I use Gemini.

The AI requires documents to be readable (OCR). There's an inbuilt OCR conversion tool in case you forgot to do it before uploading (although this uses account credits) - so I OCR prior to upload.

The analysis function is excellent at obtaining information within chapters, across chapters, and for topics through a document. This applies too when analyzing batches of documents. Information is concise, well reasoned, for pulling together information that's scattered throughout the document into a concise format. I really like that it provides document page number references linked to an in-app reader so that I can read more in-depth about a subject, which often generates more lines of questioning.

Categorizing documents by user-defined text & colour labels helps with managing files. However it can be difficult to find a file when you've many in a category as files are presented as a list; would be great to have the option of a grid format with preview thumbnails (like Windows Explorer) and a search function in the Documents section.

Customer support is excellent; I received rapid friendly email responses with robust answers to several queries.

Highly recommend if you're studying, researching and/or have alot of information to crunch.