Ha, you probably already said too much! Makes sense given the recent incentive on the ELEMNT. Given that the E & Bolt share the same electronics, I'm guessing it's a slimmed down version of the E. It is a bit porky, would be nice to have a the same size screen in a significantly smaller case.

Overall I like my E but it isn't perfect either.

I previously had a Garmin 910 which I used as a bike computer with the quick release, so a bit of an unfair comparison. But my biggest gripe with the 910 was that about once a month or so I'd lose a workout, it would get corrupted or something and fail to download to Garmin Express, which is the only way to get files off it. Give that's probably the most basic requirement for a head unit, I thought I'd go with something else. I'm pleased to say that in a year of using the E I haven't lost a single file.

In general the software seems more user friendly than my old 910, which had some brain dead decisions such as combining the backlight button with the power button, which wouldn't be so bad if it didn't lack a confirmation dialog for powering down, nothing like accidentally turning your unit off in the middle of a workout. The configuration with the phone app is really just so much easier than configuring on the unit itself. However, that ease only goes so far. I have about three different use scenarios for my E, road biking, road biking with navigation, and mountain biking. I wish they'd introduce some sort of simple profiles to make it easier to quickly swap the configuration. My workaround is to create different data pages for the scenarios and turn them on and off with the phone app, but for instance you can only have one map data page so I have to go in and change the fields on that page which is definitely getting fiddly.

My other big reason for getting the E was for navigating courses. In general it works well. The black and white maps do have their limitations in that they don't show topographical features, and they don't show street names. You also can't pan maps, only zoom in and out, and when you zoom out you lose the detail. This recently became an issue when construction blocked a course I was following, and it was hard for me to figure out an alternative by zooming out. The phone app can do that but this was just a detour and I just wanted to quickly figure it out and keep riding.

The other beef I have with the E is that the beeps are way too quiet but I gather they've fixed this with the Bolt.

I've never used a Garmon 520 or 820 so hard to compare, despite my issues my overall impression of this unit is a positive one, like anything it has its strengths and weaknesses.