We are web development company and we have chosen JoomSEF over the standard Joomla! SEF because it can be customized and there is already alot of extensions that support it. On a small site we have found that JoomSEF does the job really well, but when you have multiple pages, the loading time is slower. We didn't have much trouble with it as other users reported, but it's fair to say that we don't use many extensions (we try to keep a minimum). The only reason we rate this Good instead of Excellent is because it still needs work, it has areas that could easily be improved (such as database optimization and duplicate link generating).