The Roam is quite a bit more expensive and I have little need for navigation in a GPS beyond following a breadcrumb trail (which my Navi2coach was also capable of). That's why I chose the Bolt.Although I do wish I would have shelled out the extra money for the Roam when navigating. Inside towns the b&w screen can get a little busy.
It will allow me to upload activities without the use of a USB port, which is an improvement compared to the Edge 500 and N2C.
The Wahoo Elemnt Bolt arrived today. Setup with the Android app was quite straightforward. I physically installed it on the bike with the supplied forward mount. I had to shim the handle bar with strips of cut-up inner tubes to make it fit as my Nitto bar is only 25.4 mm. The 90-degree micro-USB cable I bought along with it lets me charge while using the device despite the rear-facing charging port being close to the bar. I deleted maps of South America and Oceania to free up space for maps of Japan.
I bought the bundle with sensors, but it looks like the speed sensor won't fit with my front hub which is a bulky dynamo hub and it's a bit too wide for the rear hub. I may use one of the other speed sensor I have lying around. I haven't tried the cadence sensor yet, but I do have a spare for that too.