Hmm Bostons makes solid but unexciting products, they are a very corporate, market-driven company.
It looks like their E series are styled to go with Plasma TVs (everyone is doing this these days), and to their credit, it looks like they are putting a deeper baffle than most companies are putting on their sleek plasma speakers.
Just understand that your paying a premium to get that sleek form factor, and it wont sound as good as a traditional full-sized speakers, which is a segment that Boston has ignored for 10 years.
I do like their in-wall 3-ways, if I was going to go full WAF, i would definitely consider their larger in-wall varieties ...
Bostons ain't cheap anymore though, they have a carefully cultivated brand-name, and you can get the same quality for cheaper, if your willing to forgo the Boston nameplate.