I got the enhanced Super GPS and speed/ cadence sensor for Christmas and really like it. I tried the navigation once and wasn't all that impressed with how long it took to reroute at times. Syncing with my iPhone and Strava was a breeze. The only experience I have with Garmin units is second hand and everyone I know complains about the mid-ride freeze, and connectivity issues. I have not experienced any of those issues.

Lezyne did just release a firmware update. I haven't noticed any changes, but it did reset my entire unit and I had to reset all my data pages, and settings so that was a bit of a pain.

Overall, I'd recommend the SuperGPS as an alternative to a Garmin.