The best thing about mailosaurus is that it gives me all my emails in one place so I don't have to trawl through them individually - this saves time! Also, since everything's stored together there are no missed details or incomplete data entries which often result from looking at different sources separately.
It also allows me quick access for any necessary changes/corrections once received by an individual client/company etc. Nothing really disliked but perhaps could do with some more customisation options? However they're always adding new features too regularly (and quickly) to keep up-to date with :) We've been using it now for around 6 months mainly just for its useful 'all in one' feature however we use it every day for clients who send us information via email.