I bought a Garmin Zumo 500 this week, and sold my TomTom Go 910. I had really specific reasons for this decision. I wanted GPS navigation for my motorcycle, and back when I moved to the UK, the Zumo was not yet for sale. So I bought the best GPS with European maps available in the US, the TomTom 910. The Zumo is unique, because it's waterproof, vibration-proof, and has an interface which is a bit more glove friendly. It also has a mount designed to really hold. I've now had a chance to use the Zumo, and here are my impressions: The TomTom UI beats the Garmin hands down. The Garmin's UI is very similar to that found on the Nuvi models, so keep this in mind if you are thinking about getting one of those. It's not that the Garmin UI doesn't work, it's just no where near as polished as the TomTom... and it's these little things that make a difference when you are driving. The TomTom has this little turn indicator glyph in the lower left corner. The glyph really shines in roundabouts. At a glance you know what to expect ahead. It's like this throughout the UI, little things that add up to a cleaner, yet more information rich display. Startup time and satellite acquisition: again the TomTom wins. The Zumo takes longer to boot, and longer to acquire a satellite. The TomTom usually had a lock before I startred moving, the Garmin is about 30secs behind. It also jacks me off with a warning about navigating while driving every startup, then bugs me again when it connects via bluetooth to my phone. Hey Garmin: ditch the warning and use a little icon to indicate you connected to my phone, not a giant dialog that obscures the map. Form factor: Garmin wins... it is larger, but not as thick making it more pocket-able. Maps: TomTom's map display looks better. Can't comment yet on the accuracy or routing ability. Cost: Zumo is close to $1000 (ouch) with EU maps, the 910 is $450 with NA and EU. So why am I still happy with my Zumo: Works well on a motorcycle. Has really nice tracklog features. Expect future posts documenting my motorcycle adventures that you'll be able to view in Google Earth. I can also cross reference these track files with EXIF data from my pictures to geo-tag them. Update: I've had a chance to use it on the bike. Check out my first impressions.