Yea. The problem is that indoor lighting is really the worst case for these outdoor intended units. You really have to see them in the noon day sun. We've had lots of people show up with cool handlebar mounts for their iPhones and other smartphones only to abandon them on the first day.

My clear order of preference would be transreflective GPS units first, paper maps second, and smartphones last. Most of our folks still prefer paper maps and I have to admit I keep a copy of the day's maps in my bag just-in-case. Sorry, but I'm just passing on what the folks on our trips decide after trying out the options. I certainly do use smartphones outdoors (on foot in the big city, mostly). But in the noon day sun they all require you to shade them with your own shadow --not something you can easily do on a bike