I bought the current Expodisc to replace an earlier model recently stolen. The old model seemed overpriced, but it was hand-made in a low volume production. Current models made by new owners are priced about 170% more than the old, for which you get a fancy box and a few instructions on a CD rather than on a peice of paper - big deal. However, the new models have a lens mounting arrangement which is much superior to the prior model and much more expensive to make. As to function, nothing really replaces an Expodisc if you need one for white balancing a color photo exposure. I use mine to shoot "grey" color negatives to automate traditional color printing. I have no experience as to whether they provide superior white balancing in digital systems as claimed, but logically they should do so. Unless you plan to be very exacting about color reproduction in your color printing, the excessive cost of an Expodisc versus the marginal benefit seems questionable. If you Photoshop your pictures to death, you will get no value from this item.