I bought a 530 but sent it back straight away and got the 830, very glad I did. Basically the same feature set but with the touch screen which is good. It’s not iPhone level good, but when you are used to using touchscreens all the time it’s much better than buttons.
Great units all round, use it for MTB, commuting, road etc. Integrates well with trailforks and nav is great on road.