no, think of it as the hash associated w/ that iteration of the tweeter (i have the 6.1s, which means its the tweeter in the WP7). i never liked the metal inverted dome tweeter, esp compared to a good ribbon tweeter or a soft dome like the one used in merlin's VSM's & rockports. the inverted dome is just too grainy & whitish, tipped & overemphasized. why wilson persists w/ the inverted dome is beyond me, but suspect its related to power handling. shame it sounds like crap in its original state.
no, i've not heard the sasha's or any of the new iteration of wilson products.