The ability to test our web application in different browsers, operating systems etc is very useful for us as we are developing an app that needs cross browser compatibility! I have not found anything yet which could be improved but this product has been working well so far - no issues at all with it's useability or functionality of any kind (apart from being able get more features).
We need some way/toolset where i can run tests against my website without having too much hassle setting up servers / other tools required by most products out there like selenium + phantomjs ect..