Are you wanting one for your bike or a replacement for the one in your car? Visibility is an issue for many of the car ones because of the screen material used. While it helps make the unit durable, it's not always easy to read displays during the day. Most will let you adjust brightness and other screen settings, so you might try that.

If you're asking about the bike, a number of us have Garmin Edge devices of various types. Even entry level models are 2-3 times more expensive than GPS devices for your car, though.