Has the new solar performance checker been useful for you? This feature alerts you of loss of performance of your system. It has recently been added to the site, and we're hoping that it will make it much easier for our donors to spot issues with their systems.
If it has helped you to identify a problem with your system we'd love to hear from you. Please email us your anecdote or add a comment to this thread, indicating if you are happy for us to use your experience for publicity. This sort of thing helps us to retain funding for the project so we can improve our service to our donors.
Similarly if you have any suggestions or gripes drop us a line and we'll do what we can to improve it.