The software installed quickly using the usual simple Canon installing screen. Then the scanning could begin. Despite how it looks, the real test of a scanner is how well it dishes up the goods in the scanning department. The FB636U managed fine. The scanner takes about 15 seconds to preview the picture on the scan bed.
Scanning speed depends on what resolution is required.
The scanner is capable of resolutions of up to 1200 dpi if they are needed. The pictures came out clearly, but as with all flatbed scanners make sure that the scan bed is clean and free from dust or other little specs that will mar your carefully scanned picture. Another tip would be to scan matte photos rather than glossy since the shine on a glossy photo can make the scanned picture a bit misty. Text reading using the Caere OmniPage was good. Overall the scanner does a good job.