FWIW, Edge 530 user here. If the 830 is even close you'll probably love it. Display easy to read. Works seamlessly with the Varia, of course, and no problems with phone/BT dropping out which I've read is more of an issue with strength of cell signal. Prior computer was a 520 and it worked fine, too.
Garmin states that all of the features of the 830 will be available on the 1030 through firmware upgrades - I don't know where they are on releasing that.