I like that it makes integration with any number of 3rd party applications easy to accomplish without writing code or having someone else write some custom software/scripts which can be complicated at times! It's not perfect but we've been able solve many problems this way rather than trying other more expensive options such as an ETL tool (which would have cost us even MORE money).
We are solving our business need so far very well using thru - there isn't anything in particular i dislike about throug; however if you do find something please let me know because its great working wihth them!!