There is definitely a need for this service. Having machines running three OSes, and a plethora of browsers, on your desktop is not yet an option. While it certainly is possible to _have_ a server farm with all these OSes, why not just let someone else maintain that nightmare? Sysadmin hell is what I call that.<p>The service is slow, but that will change. It "just worked" for me running OS X 10.5 with Firefox 3b5 - I didn't even check if I had Java or which version my Java was, everything went smoothly. There were some artifacts from moving the mouse, but it let me view several of my pages and gave me some good views of how others see my sites.<p>I think the pricing model is reasonable.<p>Perhaps what you can do to extend the service is allow users to pay for a set of mouse movements, record them, and run them on every OS/browser/flash combination. Then allow customers to play those files back on their own machines at their leisure, instead of doing it in real time. This would allow a web developer a way to create a 'use case' for their page, and see how it behaved across various platforms. Also, you would not have to supply so much bandwidth, just compress the results and provide them for downloading later.<p>I'm a little disappointed in Hacker news for the negative comments on Java. While I don't write Java, and lots of my perl colleagues dis Java, I would have thought that this Lisp-centric community would be more tolerant and agnostic when it comes to choice of programming languages. After all, it the innovation of the final result that matters, not the tools used.<p>I wish you luck Tony with your service, I am sure it will be a success!