Major speed increase. really boosts performance for Joomla. I started using it at v1.04 and was using 1&1 as a host at the time. It made my site load much much quicker. I had a couple issues that were resolved within a a couple days and a new release. The author is very responsive and works hard to find a fix for your issues. I currenly switched hosts and am now with WestHost. My site speed is at least 15 times fast now. My joomla site is pretty bloated and has lots of modules, components and mambots running. 200k+ frontpage. 3 modules that rotate whenever the page refreshes. My load times are 1.5-3 seconds on average and as low as .9 seconds! I used the Faster Fox timer for my times. Page cache currently doesn't work with rotating banners but will refresh them after the cache TTL runs out. my site is http://www.AbundanceTips.com . I currenly have page cache uninstalled due to testing with eaccelerator. My site is blazing fast with eaccelerator on the server. With the two running together is about the same but page cache should provide additional server overload protection from being slashdotted or the Digg affect!