The free trials went very well not the charged ones...
The free trials went very well, 20 pages review for tens of credits and pretty accurate references. After subscription, the same review cost me hundreds of credits with less accurate references. Today, I never know how much I'll be charged for any request, and a 1200 credits only allow me 4 or 5 requests, with reviews consisting in less than 10 pages, with references which don't exist. Honestly I don't recommand it at all. It is not transparent nor consistent / reliable. Despite my ongoing subscription, I now prefer to use ChatGPT (also subscribed) and Claude (free) with better results and much less limitations.