Overall Satisfaction with Google Trends
Google Trends is a great tool to discover trends on specific keywords. It is really useful to anticipate traffic increase at some periods of the year (for SEA or SEO campaigns).
- Traffic trends
- Keyword suggestion
- Related keyword traffic trend
- Trend on a specific location
- Small impact (but positive)
Google Trends has the biggest source of data and is the most accurate. It cannot be used without any other tool because of its own limits (keyword suggestion, semantical analysis, etc.).