My only warning is that it can save some very personal data, and AFAIK it is not stored encrypted, so be cautious, especially when websites take credit card details or passwords in plaintext without correctly telling the browser to not store these values.
The default clear time is some 90 days which seems far to long if you forget to clear such sensitive data. I would recommend reducing it down to your longest browsing session (time until you close all your tabs and start again), which for me is a few days.
