I purchased this scanner to replace another CanoScan unit that I have been very pleased with for the no wait LED document scan feature, which works quite well. Almost every day I have 1-10 documents I need to scan and save to an encrypted pdf data base, but not all at once, so several times through the day I had to wait out the warm-up time, which was often frustrating. The 5600f filled my need on that front, and waiting is no longer an issue. My 4200f is being deployed to another PC in the house, and is still working quite well. I do have a massive slide and photo project that covers a ton of inventory, but I knew going in that it used the warm up flouresant tube, but that is different because it is a project where you scan non-stop until you are tired of scanning. For those who have used Canoscan Toolbox for a long time, like myself, will find the new software package very, very, different. I had the Toolbox doing what I needed without much thought, and slowly the new version is starting to click.....I will future post should I find problems with it. I will also future post to give my opinion on photo....so far, only done a few, but the quality looks pretty high end considering the price of the 5600.