“Good enough” depends on your expectations. If you are familiar with audiophile sound quality, then your expectations will be high and you won’t like these speakers. If your expectations are not high, then you might be happy with them.
You can’t really get a feel for how any speaker sounds just from the specs. I’d never buy any speaker without hearing it first in person, especially something as permanent as an in-wall. Did Fry’s have these installed in a listening room?
In-wall speakers in general have issues going in, simply in due to the fact that they aren’t mounted in a rigid cabinet. As a rule, take any given decent-quality speaker – a bookshelf model, for example – and the cost of an in-wall that sounds as good will be at least two times higher, and probably more.
One thing that jumps at me is the “polymer” tweeter. Polymer tweets are typically low end and don’t sound nearly as good as say, silk-dome tweeters.
If you can swing it, I’d strongly suggest going with regular speakers for your front three (i.e. bookshelf-sized), and limit the in-walls to the back channels. I have a buddy with this arrangement and it sounds fine.
Regards,
Wayne A. Pflughaupt