This is a very good driver when used properly. It should not be used without a tweeter, though, even though it has a good freq range.
The high excursion capability means that on higher levels, without a tweeter (which should be crossed at 2500-3000hz not higher) voices will sound "interrupted", like a Doppler effect. Not sure how to describe it.
It gets 5 stars because with a tweeter, you can get a very good sound and digs very low for its size, in small enclosures.
It also gets pretty loud if you eq out the very low end using DSP.