Like Jamo
I have Jamo in Walls and they sound pretty decent. Their quality is very good and in line with Speaker Craft and other well respected brands; their price is too (not cheap!). I am sure that they produce low and high end stuff, my question back to the builder would be exactly what speaker in Jamo's line are being installed. I'd use that info to find where it falls in their speaker line. Depending on the price the builder is charging you, and the speaker, I might insist on an upgrade or credit for the speakers with roughed in wiring.