This extension is as good as it gets, and as far as I am concerned mandatory for any Joomla site, be it 1.5 or 1.7+. I have used this successfully for one year now and won't look back. I had some minor troubles and their support team answered me quickly. Most of the time it wasn't their extension causing the problem. It's very well thought out and will had a major impact upon my search engine standing in Google when configured properly. One of the best features I have found is the abiltiy to create unique meta description tags to override the Joomla core created values. This is very important when using the Glossary extension as Google we see repated meta descriptions and penalize your SEO score. Buy and be done with it!