Whether this is a good tool for you or not is really going to depend on what exactly you want to use if for. I'm using it simply to pluck sentences I like out of books and dump them into Anki. Or maybe I'll use it when I'm reading a book, and I want to run a particularly nasty sentence or kanji through an online translator (just speculating here. I haven't done that yet). Also, the text needs to be clean. It's not going to be able to read something you can't read, and it won't handle text that's been boxed in and text covered with strikethrough marks. You need clean and clear text. It can handle a single underline by ignoring it, but anything more is pushing the software.
Anything else would be faster to either scan on a flatbed or just type in yourself. Again, it depends on what you want to do with it.
It faithfully records the image you produce, then it analyzes it and tries to figure out what you did to it to screw it up, and then tries to undo it. That's how it appears to function to me, anyway. Honestly, I don't think they got too sophisticated with the hardware. I think they do all the heavy lifting in the software.
For example, when you scan vertical text, you actually rotate the book 90 degrees counterclockwise, so the text is aligned horizontally, where up is to the left, and down is to the right. Then you just scan it like a line of horizontal text. The software rotates each character 90 degrees clockwise back to vertical, and stacks the series of little images up. Then it OCRs the resulting overall image. There isn't a long wait, either. It processes the image pretty quickly.
That's at the extreme end of its performance. For most scans where the pen is wayward, it will account for the distortions a little less drastically. It has a little roller by the scan head that activates the scanner, so it has a way to know when the scan head is moving, and how fast its moving. But I think the software does the majority of the image interpretation and OCR, so I would guess that you'd need their proprietary OCR software to make it work.
Workflow issues are always going to be subject to individual variations. Once I got comfortable with the pen, getting good scans wasn't so much of an issue, although there are a lot of little annoying environmental variables that can either really make things go fast or bog things down. (Like a thick book with a very springy spine, that doesn't want to stay open for me.)
For me, it's probably about the same speed as typing, only with much less stress on my wrists and hands, and less messing around with the language bar. If you screw up, it's not a biggie. Just scan it again. They designed the scanner so if you hold it so the scan head is flat on the page, it will be a the perfect angle.
I don't have a big problem with making an extra pass or two, because the stress on my wrists is just about zero, compared to typing, which is fatiguing. I wouldn't necessarily say it's faster than the old way, but I would say that it's easier for me. I can see how it would infuriate some people.
And you point out a very nice thing it does do, and that's figure out what the correct kanji is for you, without you having to look up its proper reading so you can type it in. But a flatbed will do that for you, too.
Give me a week to work with it some more, and ask me how I feel then.
Did that help any?