Unfortunately I’ve already ordered the 820. Wish I’d read the last too replies before ordering. There’s a deadline before delivery gets delayed by a day. So I’m going to cancel the order.

Both of the last two replies mentioned real buttons. I think neither the 530 nor the 830 have real buttons. And frankly my ailing 510 has had two button failures.

I'm probably going for the 530. Don’t use navigation on such a tiny device anyway. Prefer to stop and use a smartphone for that with a much larger screen.