No, it worked for me-if I could post pictures on here I would show you. I put In my GWF # and It has a bar that said my application has been decided and the date.It says that it should be with me in 10 business days but today is the 11th business day.
Others from the US are using it too and it is working
Didn't say it didn't work for you, just saying that it SHOULDN'T actually have worked for you, because the tracking service is not supposed to be available for applications made in the US

.
Guess they are being sneaky about it

. Not sure that the 10 working days actually applies though, since that's strictly an 'inside the UK' timeline.
If you're applying in the US, your documents are normally sent out 1-2 days after the decision has been made and then you receive them 1-2 days later, depending on your shipping service. There's no reason for it to take 10 business days back to the US.
Not sure why yours is taking so long though.