I have the I1 Extreme and use it on everything.
I just got around to making a profile for my converted scanner. I removed the original glass case from my 11x17 scanner and made a flat clear glass bed so that there would a flat surface to scan art canvas larger than the 11x17 original opening. The clear glass did cause a change in the scan but almost for the better but once I made the profile with the Eye one, the scans are very good for color and not much color corection is needed.
The Eye one has been quite easy to use but I think this model is no longer made.