Woah, an English review of a Japanese product? WTF. Yeah, because English speakers need this thing too.
I don't have all the amazing details of this product because I've only really studied Japanese for about a year and know only about 600 kanji. I can tell you that this product, at almost the same size as a gameboy DS, is pretty much the best thing I've found for my language acquisition. The entire thing is in Japanese with no hope of English except for the features, but there's a small sheet enclosed that shows you the basics of the dictionary in English. It's extremely easy to look up a kanji, it's stroke order, and even how it looks in the freestyle writing styles and all it's readings. For the kanji lookup, you can do it by Chinese reading, Japanese reading, stroke order, radical stroke order, etc etc. If you are using the handwriting section, you can look up kanji compounds by handwriting the kanji. Even if you don't get the strokes perfect, it usually guesses it right, and if it doesn't, you can click the kanji to fix it manually among other common choices. You can do the equivalent of copy/paste really easily from dictionary to dictionary (for example, excerpt a kanji from a complicated passage, then look up its stroke order in a different dictionary, since each dictionary is compartmentalized).
There's a ton of extra features I plan to never used, such as entire encyclopedias and dictionaries of English expressions, but I imagine it makes the dictionary more well-rounded and useful for the Japanese crowd.
If you're considering between this ex-word and the B10000, the main difference is that the b10000 has a classical Japanese dictionary (you know, from ancient times), and this one doesn't. You lose a few other features you're not likely to use unless you're a Japanese language researcher or something.
If you're considering other ex-words, just know that they all have the handwritten kanji recognition and a jap/eng dictionary, but some of them don't have the SAME jap/eng dictionary that is considered the best dictionary (kenkyusha), so that's where you're sacrificing if you're a beginner settling for a model that's way cheaper for the same (usable) features.
If you're trying to learn how to use this dictionary and can barely read Japanese, check out a youtube review of pretty much any ex-word, because all the buttons are almost exactly the same, even all the "custom" ones at the top.