They are nice drivers but not efficient. You have to look at what you are matching it up with. If you run it down that low in a home audio loudspeaker, your typically dealing with a baffle step correction. The 89dB is @ 2.83V so you have to be careful that your woofer combination isn't more efficient than the midrange. If you plan to use the midrange below the baffle step correction, of course the system is even less efficient as you burn 2-4dB on the baffle step.
I like to run midranges to the baffle step, and let woofers do the rest. That way you don't end up really pushing a small driver into high levels of distortion and/or thermal compression by effectively making them run the hottest in the area where their distortion starts to rise anyway. The baffle step is easy to impliment because you just pad the midrange/tweeter appropriately. There are not many FR issues when crossing over there as long as your woofer is close to the midrange. Most 6.5"-10" woofer have no problem crossing over that high and the off-axis response is a non-issue because your entering the range where the driver is radiating ominidirectional to begin with.
Crossing over to the tweeter should be done where the off-axis response of the midrange best matches the tweeter. By using a midrange, you greatly expand your choices of affordable tweeters.