As others have similarly noted, sound quality is of the utmost importance when selecting a speaker. I would (and do) consider asthetics when choosing a speaker and size will be a consideration, whether large or small, as it will need to within a certain location dependent upon the chosen application.
Build quality is a 'nice-to-have', but I feel that if the expectation of sound reproduction of the speaker is met, the build quality will go hand-in-hand with this, regardless of the material used.
An 'other' that comes to mind is an excellent value when considering the performance for price. You asked!
Nice to see manufacturers and distributors collecting this kind of information and (hopefully
) putting it to good use. Thanks for the opportunity... -TD