Absolutely Awful - Sente seems much more stable; it doesn't have Cite While you Write (CWYW), but then again EndNote's CWYW crashes virtually every time anyway.

Having previously used EndNote fairly reliably on a PC, I bought it for Mac before the 'X versions'. That version rarely worked, but given the hype about the newest refined X2 version and CWYW fixes, I paid again for the latest update (another £75 or so!). It is every bit as buggy, and has virtually no innovation over previous versions. In contrast, I am now looking at Sente, which lacks the much hyped integration with Pages, but will produce bibliographies for Pages outwith the application itself after inserting easily formatted citations. Sente also features a much more intuitive interface, web search facilities that actually work, and a great system for linking downloaded PDF files to the citation database. It can be a little slow opening my 50k database, but not intolerably. Unlike EndNote, it also has a trial.

I have to reinforce what others have said about a complete lack of Quality control from the EndNote developers for Mac, which is amazing given the extortionate prices and update charges. I am disappointed that Apple have tied themselves in with this company, and can only hope that they also open up 'Pages' integration for software developers that have a track record of interest in the Mac - Sente and Bookends for example, which I understand are both better than EndNote, but could be better still with Pages integration. Only thing I will say for EndNote, is that their UK distributor at least was supportive and did give me a refund.