I use the exciter in Ozone more often than the BBe Sonic maximizer.
Though the effect is similar to an exciter, according to the company the BBE performs a phase alignment to the speaker frequencies. It is this alignment that sharpens the sound.
There was a discussion here awhile back on it and some think the BBE explanation of what their product does is snake oil. My opinion is that it probably does what they say it does.
In the end it has the effect of excitation but doesn't do anything with EQ or harmonics like some others do.
This is important to the thread I think because IMHO it really isn't an exciter
per se.