Personally, I think the bose system is terrible. Systems like this are what give Bose a bad name to audiophiles. It isn't really quality, or all that different from other factory systems. My passengers have all said, "Ooo, you have Bose, they must be nice". Innovation through marketing...
In order to have any reasonable sound quality, both the bass and treble settings must be set so far below flat. It isn't even funny.
The tweeters are harsh and undefined and they are crossed over really high. The midbasses don't have any low pass filtering on them. They are allowed to roll off naturally which typically makes the midrange harsh.
The one plus to the Bose system, that I'll give them credit for, is the stage height. It is pretty good. But the lack of lowpass filtering on the midbass and the high "crossover" point of the tweeter is what creates this. Of course, it is at the expense of midrange clarity.
Not to mention, the low midbass is muddy at any appreciable volume. I find myself turning the volume down sometimes, just because the midrange is too harsh and hard on my ears.
I recently bought some Seas woofers and tweeters to install in my MS3 GT because I can't take it. Seas is a Norwegian speaker manufacturer about an hour or two southwest of Oslo.
-Mark