I own a number of EA cabs, as well as a Raezer's Edge Bass 10. The Bass 10 is very much a midrange cab, but almost to the exclusion of other frequencies. It sounds boxy in comparison to my EA cabs. That said, after you play on it for a while, and get used to its sound, you can hear what you are playing quite well. For certain instruments, I can see where the Bass 10 would speak very well. While I have not heard one, I would suppose that the Bass 10 and a Bass 12 together would be a very good match.
As mentioned above, though, EA is tough to beat. They really do point out the shortcomings of the Raezer's Edge cab. I strongly prefer either the VL-110, VL-208, or Wizzy to the Bass 10. The EA cabs are much more clear and accurate, and have better, stronger, deeper, more articulate lows. The high end on the VL series is not harsh at all, nor is the Wizzy. I have heard, however, of some folks not caring for the more aggressive high end of the CxL series. Of course, this is why you have attenuators on tweeters. If you can't tell, my recommendation is to go with an EA cab. The Wizzy is a marvel, but the VL-series (especially if you use two or more of them) are my fave.
I must say, however, that both EA and Rich Raezer are absolutely top notch and a pleasure to deal with.
Tom.