I’ve got the roam, it was a struggle to get into it, but now i enjoy it for what it does, mapping wise it shows me all the bridleways, paths, etc in the area, so i can link together trips, i can extract the routes via my phone and review and take out bits that are useful for future.
Does it do anything better than a 530, haven’t a clue as i never used the 530, is the mapping great, probably not great, but it’s adequate, it isn’t full on OS Maps, but it does highlight the off road stuff to me, as the name says, it lets me roam about and hunt stuff out without ending up in the middle of nowhere, or not knowing there’s some type of path/bridleway i’m heading towards.