Not this one! I found myself up and running very quickly!
I don't agree with the other user comment that you have to keep dragging from the default location. I think it's nice to see where you are based! The user obviously didn't realise that all you have to do is click the minus button a few times to zoom-out and then you drag to your location (10-second job).
The only feature I would ask for is a way to edit the message when the user clicks the "Send" button. In UK, we would use different grammar to "Thanks for you !"
Thank you - very nice component.
Thanks for your comment ...
Way to customize "Thanks for you !" http://joomlasrilanka.blogspot.com/2010/05/change-comgoogle-thanks-for-you.html