I own a pair of Glenair 15" (paired with the ST200s). I would describe the sound as shockingly lifelike; and I would also add that they're kind of 'finicky', in terms of matching them with other components. An audiophile chap from the Orient suggested that they're best paired with hand-made exotic tube amplifiers/preamps made overseas. I guess it's a matter of taste.
In my experience, Tannoys do reproduce vocals like no other speaker.