For integration of scanners to DT Pro Office the weak link is the driver provided by scanner manufacturers. The TWAIN standard is often treated very loosely (which is to say, sloppily).
For scanners tied to TWAIN or Image Capture, I’d have to say that Canon drivers are most likely to “just work” with DT Pro Office. Epson and HP models have variable records, and Brother drivers don’t work with DT Pro Office.
But there’s another mode of scanner integration with DT Pro Office, using a scanner control application written for the scanner, often provided by the scanner manufacturer for at least some models.
Fujitsu’s ScanSnap uses this approach, via their ScanSnap Manager application. Works great with DT Pro Office and I’d agree with another poster that the ScanSnap is my favorite scanner.
Most of the scanner manufacturers also provide a scanner control application (as opposed to just a TWAIN driver) for at least some models of their scanners. If the scanner control application can be configured to send scanner output to DT Pro Office, that will probably do the job of integrating the scanner and DTPO2 via the the scanner control application. That would be the best approach with a Brother scanner, for example.
Has the manufacturer updated the scanner control application and/or driver for your scanner model to the version of OS X you are currently using? Again, not all manufacturers are equal in the speed of updating after an OS X release, or in updating for older scanner models.
Not all scanner models are OS X compatible, and if the box says it is OS X compatible but mentions just OS X 10.2, it may not work under Leopard or Snow Leopard.
Before making a purchase, it’s a good idea to do some research. Go to the manufacturer’s Web site and check out the features. Pay special attention to the specifications for your computer’s operating system, whether a scanner control application is provided and the operating system requirements for that software. Don’t make a decision on price alone – although there are good scanners that cost no more than some that I would consider cheap junk. Do you really want one of those all-in-one printer/scanner/fax models? It may work for you, but remember that if one component fails they all do. Did you know that you probably won’t be able to scan if an ink cartridge needs replacement?
I usually look at a manufacturer’s software update/driver update support with one question in mind. When my equipment is 3 or 4 years old, will they still be updating it? Some only keep their recent models updated; I don’t want to buy their stuff.
One of my scanners (CanoScan LIDE 500F) is an inexpensive flatbed scanner that I’ve had for years. Under OS X 10.3.9 to 10.5 it could send output directly to DTPO via Image Capture (and later also by ExactScan Capture) and by a software application that came with the scanner. For several years I used Canon’s own software application to send output to DTPO for OCR. That software application no longer works the with latest Canon drivers under Leopard or Snow Leopard, but the scanner still works beautifully for DTPO captures via ExactScan Capture or Image Capture. I appreciate that kind of support. Canon didn’t make my years-ago purchase obsolete.