Love my Bolt, but have no experience with other computers to compare it to. Def rock solid, have never had an issue or lost any data, screens are easy to setup and navigate while riding. Map size/detail is a bit lacking, but I've also never gotten lost when following a route that I've loaded (which is the only time I use the map screen, if I'm out exploring and want to see where I am, I stop and look at the map on my phone).
Just saw a Roam in person the other day, and it is considerably larger than the Bolt, and it's color, so the map/nav is probably easier to use. Personally, I like the small form factor of the Bolt, and it's still very easy to see important ride data like speed, time, distance, etc. (depending on how much data you display, the fonts get smaller the more rows you display, but I have no problems seeing with four rows of data).
