According to Tablet PC Blog, the Motion F5 and C5 Tablets have the best outdoor display in the market and to prove this they have posted few pictures at their site

Those who never has seen an outdoor display won’t understand what we are talking about. This is something that you have to see it to believe it. The difference between an outdoor display and a regular display is like day and night. So, if you are an outdoor enthusiast or if feeding your family depends on using a mobile pc outdoor, I would recommend you to find a device with an outdoor display. 

Via:  Tablet PC Blog