I used it for 3 days before a guy told me to give old fashioned maps a try, and gave me a few state maps. My tank bag has a nice window slot for them, so why not use it in tandem?
Within 2 hours I had totally stopped paying attention to the gps and just went off the map. The next day I didn't even use the gps at all, and ended up using just maps for next 3 weeks riding around the country.
If the signage is good (in the US it's superb, people just don't pay attention to it/understand it) then I have found a regular old maps to be far superior. You can quickly see all info on the map (no dicking around with zoom/scrolling on the touchscreen) and you can adjust your route very easily on the fly.
Seriously, I cannot recommend paper maps enough. Take some time to understand how to read the map (if you're not sure already) and pay attention to road signs. The two integrate beautifully and make getting around easy. If you have a place to put it on your bike, give it a try.