We have recently been using Aspose Total for Java in our system. I am happy to report that it has been a great experience for us!
Our application stack is PHP/MySQL - and we had spent a lot of time investigating custom PHP options for conversion of documents and email management. However, we hit many 'dead ends', and decided to give Aspose Total a try.
Using some simple examples, we were able to get our PHP code to trigger their Java functions - so we can now manage MS Word documents in our Linux environment - which is great.
We look forward to using some more aspects of their library as we go on, such as the ability to convert MS PowerPoint files aswell.