A few of things I've learned to appreciate about our Garmin's:

• No installation of wheel magnets, installing the pickup on the fork, and routing cable to the handlebar.
• The fork no longer looks like a science experiment.
• Never have a wheel magnet become misaligned from the pickup.
• Swapping wheels is a non-issue.
• No wheel size calibration. Wanna move my Garmin from the tandem to a mountain bike? No problem!
• No buying those pricy "button" batteries at the least convenient time.
• Custom display. Show the data you care about and nothing more
• Installing a computer on a new bike takes 10 seconds, maybe 20 seconds on a bad day.
• Never have to set the clock.

I was a slow adopter with our Garmin, but after a month using it on the tandem stoker was adamant she wanted one for her bike.

YMMV.