It's better than a Marten Supreme because the mid is cut off @500Hz whereas Marten cuts it off at 1,3kHz "where the ear is at its most sensitive". Note: they must be referring to latest technology ears -- not the traditional ones (i.e. the ones most people on this site probably use). Whatever, if you say so.
That 2,5" ceramic must be doing a hell of a job playing well at 500-600Hz up to I-don't-know-where (5-6 kHz ?)...
Anyway there it is for your casual perusal.